If you are looking to take your training to the next level then consider one of my online science based training plans available here: www.trainingpeaks.com/coach/dylanjohnsontraining#trainingplans
If wider tires have lower rolling resistance and assuming this does not apply to bicycle tires only, then that means putting wider tires in cars can actually improve efficiency?
@@sepg5084 as it was said in the video, there is a limit in both directions. As far as i know, car tyres are already very very wide as the are optimised for grip, not for rolling efficiency. Look at the electric car tyres where efficiency (= range) is critical, the are much thinner :)
Let me know if you liked this style of video and if I should include more guests in the future. There is a lot more from this conversation that I plan on releasing. Find your optimal tire pressure with the Silca Professional Tire Pressure Calculator: silca.cc/pages/sppc-form Find out which tires are faster or slower with BicycleRollingResistance.com: www.bicyclerollingresistance.com/
Hi Dylan, I very much enjoyed this style of video. I was hoping Josh/you would get into discussing the pros/cons of various tread types & tire manufacturers. I've been on nothing but Rene Herse tires for years -> Barlow Pass 38mm slicks which actually measure 43mm on my FSE 27mm internal width wheels... However, I've had my eye on some Vittoria tires as well. Thanks again for the great content!!
Id say the big guys are actually working for the rubber producing companies like maxxis but for sure its great insight although i would have loved context on especific tire recomends and pressures for different types of riding? Hard choice when there is 490,000 tire options
I got a new bike! I ran 25mm tires at 120 psi on my old bikes for many years. My new bike came with 32mm tires. I used a tire pressure calculator and I currently run them at 55/60. I don't think these tires roll faster, but they are much more comfortable on the chip seal road surfaces I ride around here. I'm old, so comfort is a priority.
Thanks Dylan I am one of those guys that ran as much pressure in my tire as I good back in the day. (1980) Know that I am a bit older (68) I can use every bit of help I can get. LOL I've been running lower pressure for years and it helps make the ride more enjoyable and at the same time faster. Good tires at the right air pressure, the best chain you can afford, best chain rings and cassette, then bearings and a frame that allows the peddle stroke to move the bike forward with no energy loss. With that in place we have NO Exceuses. Ride hard and with passion. Rick
I hear ya, I’m 68 also, raced bikes in 76, and mountain bikes in the 90’s. I always used 110 in my sew ups for races on the road. Now I use 100 lbs. in the rear, and 90 lbs in the front (700x25 clinchers) for rides. My mountain bike I use tubeless tires at 35 to 40 lbs. hard tail with 110mm Fox front shock. I still love to ride regularly.
This was so useful. Used the linked calculator and found I was about 10 psi too high. Let the excess air out and sure enough the bike feels much better and no noticeable change in speed over the last 3 weeks. Thanks Dylan + Josh 😃
Josh is amazing and definitely knows all the details and has all the experience working with cycling teams and testing products. I buy Silca products because of his insight.
I've been buying Silca products LONG LONG before Josh took over (I have an orange Silca Pista floor pump, and an ancient Silca Impero frame pump from over 52 YEARS AGO, when I first started racing on tubulars, both still fully functional!!). But yeah, this man most definitely knows his subject matter, and then some! (He might even be able to change my old school, died in the wool
I remember when Vredestein sold road tires with their advertisement that you can pump them up to 150 psi for decreased rolling resistance. It is interesting how things have changed.
Great content. Great guest. Love the MG podcast. Please consider a conversation with Jan Heine, Rene Herse. If I recall correctly, Josh has hinted on the MG podcast that he may disagree with some of Jan's findings/testing/data on wider tires not being slower. If you could get a full length panel discussion with both of those guys - THAT would be gold. Keep up the good work, Dylan.
I definitely agree. It's hard to have a conversation about low tire pressure and rolling resistance without mentioning the huge contribution of Jan Heine!
Right on! We ALL have left countless watts on the course because of this. I found the insert discussion especially valuable! A deeper dive on this would be great! 👊🏻💥
I was drawn to tire inserts (Vittoria Airliner) for a 28mm road bike rim. I don't compete, but I was looking for added confidence that my tubeless setup would not leave me stranded in a rural area - - where I live. At the time I was running Continental GP 5k (TL), and they were notoriously hard to acquire, and even harder to mount. The Airliner just made it impossible for me. I never tried the insert with the Pirellis that I used to replace the GP5K's, but these are much easier to mount. In the end, with this new ease of installation, I have abandoned the inserts for the road bike, in favor of carrying a few patches, a boot, and an innter tube.
Really enjoyed this. So many interviewers love to jump in and take the show. But this was an interesting dude and you kept the convo moving forward. Loved it.
Very interesting! As a downhill/enduro bro, I actively look for a tyre with high hysterisis to keep grip on trails. Michelin tyres are a great example; very low durometer, very slow rebound. Those characteristics keep the tyre from feeling bouncy or "pingy" when riding through fast, chunky sections.
After looking into the TIRE PRESSURE CALCULATOR and seeing how low the suggested tire pressure should be, I'm very enthusiastic to try it out! It's pretty sweet tool. Thank you for the insight!
@@ighfirlee If I were to worry about damaging my bike, I would ride slow, flat, boring tail trails... However, I can't worry about that! I would rather have the traction to make the turn and grip to dirt accordingly! Plus, my ENVE carbon rims have a lifetime warranty :) Ride On!
I like the discussion. Remember years ago, seeing a set of roll down tests of different tires and pressures, and a 'quick and dirty' correlation between how easy it was to deflect the UNINFLATED tire on say the sales rack and the rolling resistance; the easier to deflect, the easier to roll. Goes along with the hysteresis losses examined in the vid. Not foolproof and lots of qualifications but workable.
Jan Heine from Rene Herse Cycles was describing this 15 to 20 years ago and got a lot of flack for it. He did a lot of test with power meters and also with different tire width to prove his findings. Still today there are riders who still believe in maxing out their tire pressures and has still yet to figure it out. Great video, I have heard Josh Poertner talk about this in the past and together with Jan Heine.
Yes, please do more in this style! And definitely let us hear the immediate follow-on from this one. I'm on Tubolight in two different wheelsets per your recommendation and I'm convinced they (insterts in general rather than tubolight specifically) are the most underrated tech in gravel/cx at the moment. It was really fascinating to hear more of the science behind how and why they work and what sets different types apart from one another!
Super interesting discussion. I felt like we could have kept going with the topic. I think it’s nice you’ve brought in industry experts and pioneers to discuss a subject. Would love to see more. Maybe you have podcasts in your future?
Explanations were very understandable and made sense. This content and others that you have shown have helped shift my perspective. That's been very helpful and have provided for a more enjoyable experience on and off the road. Thanks.
Absolutely outstanding video; your contributor Josh was excellent and informative - the perfect mix of technology, application and real-world knowledge.
My experience is that the more expensive lightweight high-performance racing tires seem to be more prone to punctures . They usually have thiner sidewalls and less rubber overall in their construction.
Of course, but it isn't a 1 to 1 correspondence. The Continental 5000S variants for instance are very fast and pretty durable. As you go to tires much faster than that, you need to consider the course, and replace them sooner.
The rheology of tires and the rubber compounds used to make them is so interesting. The balance between elasticity and energy dissipation in polymer systems especially in the context of real world performance is very fascinating to study.
Hi Dylan your my go to guy for everything cycling racing related, your very specific in you videos and all the stuff is 100% related to my cycling,, keep it up, don’t change a thing, your by far the most informative
Unreal stuff. Way too much info that I have been looking at, from the silica wax vs one I'm using, to the vittoria foam inserts added resistance. That man is a wealth of info.
Great conversation,Dylan. On a side note, while understanding this was a completely different setup, the audio of your voice was significantly better sounding than recording in your (assuming) garage. Was much easier to listen to.
So you are confirming something I've been observing for a while but never really checked deeply. I've been thinking about this loss of energy when going with high pressure on road with loose gravels
Great Video. I enjoy that you vary the style of your videos. The scientific-paper ones are nice, but interviews and alternative approaches to topics really spice up your channel. I like it. Also: Great topic here
Adding some diversity to the channel format is good. We all enjoy your scientific format, but branching out can be good, and I found this chat interesting. Maybe once the race calendar starts you might want to do a video with some of the new teammates. Unbound pre or post race video with The jukebox crew.
This is what I like the science and engineering part on how to be more efficient and faster . In this case it's about rolling resistance and how to maximize that to a riders advantage . That's why constant tinkering can help to improve performance . It can be 30 percent or more of your overall effort figuring things out . If not your wasting your brain power and just focusing on athleticism . Now some ( not many ) can rely on that but most of the rest will have to find an advantage to keep up .
I'm so glad you asked about the inserts. (I was not surprised you did though!) I don't think I've ever heard authoritative, objective information on them before.
Hi Guys, I like your talk about tires and tire pressure. Because of it I tell you what are three players which influence RRC on the smooth drum: hysteresis, deformatin and volume of material Those tree players have in paralel impact to: wet grip, robustness, footprint, stiffness - > effect: grip, durability handling &comfort. Good balance of tire design or selection is key to success 😊
Dylan, Really good video. Your training videos are the best but introducing other topics/styles such as this is really interesting. Great to learn from experts.
So the days of two people putting as much force into their pumps to get 150 lb into 23 mm tyres have gone .I m thankful for seeing this vid.Used the Silka tool and lowered my 25 mm s to 80 lb and I m not only more comfy I ve already beat my 30 mile time on my usual course plus I m too bothered about bad gritty roads now .Handlebar buzz also nearly all gone
Love the bike on the stand back there. Huge Lemond fan here growing up. I'm very intrigued by all this lower pressure stuff. I remember putting 140 psi in my 18mm Conti GP4000's back in the day, and I had that Silca Track Pump too, haha.
Same ... back in the day (30 years ago - heck!!!) I was running 18mm Conti GP's at 120psi, on my Mavic Open Pro rims ... boy did they sound lovely on my local 10 mile TT - was doing 21 minute 10's back then (not now 😔) ... god knows what I would have done on one of todays aero bikes ...
Your video helped me to understand the 'why' behind the what better than others have. I knew that a 'more supple' sidewall helped reduce resistance. Now I have a better sense for why. That's cool and thank you.
I liked the commentary. I'm glad you found someone with experience and an open mind to change. Josh Poertner strikes that balance of modern thinkers in an industry sometimes that is stuck in its ways. It was refreshing to hear someone state that comfort and traction are real considerations. It was also nice to hear that he agrees that roller tests do scale to real world results. Arguing that there is little or no value in roller tests is the new vogue of the retro grouch. Finally, my take is that the product mentions were relevant, and I didn't feel he was a shill for one company or brand. Nice.
Exactly...as long as you stay below the "breakpoint" pressure for a particular tire/load/speed/surface, the results scale exactly. In fact, that's how the "breakpoint pressure" was first identified, i.e. the pressure at which the roller data diverged from the field test data...which, of course means that as long as you're prudent about pressures, they're a valuable (and relatively easy) testing methodology.
Yes, this was a helpful video and my tire pressure was too high 10 PSI in the front and 20 PSI in the back. If you are on a track having high pressure and thin tires is the way to go. However, on the road with thin tires may be fast but if you get flats your gain is not worth much. I went on a bike ride and I saw other riders getting flats left and right and I did not get any flats. I think due to poor tire selection that many riders were getting flats and it took them out of the ride for a chunk of time.
Proceed with caution.. haven't experience myself, but word is that these inserts are great functionally.. but make removal of tire almost impossible... reports that teams that used them literally cut tires off to remove rather than trying to pry them off with levers 😳
I've had no issues with my Vittoria gravel insert. I only installed one on my rear wheel since I didn't want to spend for both wheels. They were really easy to install. Basically just like an inner tube. They give me that extra piece of mind when I do rougher trails and small jumps on the gravel bike. I'd say it's worth for the rear wheel. 😊
One of the best and most tecnical videos about tires I have ever seen. And from my experience I agree 100%. On the Silca link I miss the rim width variable and afew more details like disc or rim brake, comfort average or performance and also dry, mixed or wet surface, that in the old “my mavic” app were. But still very sweet link
To be fair, it asks for "measured width" of the tire, which takes into account the effects of rim internal width (i.e. how it affects the width of a particular tire when mounted). Brake type doesn't have any appreciable effect on the pressure requirements either.
Great video.. really love Josh.. he really thinks outside the box and challenges the general consensus.. WHICH IS AWESOME!! I’ve followed his and Tom Anhalts thinking on this in great detail.. all great stuff! VeloNews’ did an analysis where they used a air shock as stand-in for a ‘flappy meat bag’ (aka a rider 😀) not sure everyone noticed, but if you look carefully at data it actually demonstrates that some of the attributes that you might assume would be predicted to be correlated with optimal tire pressure e.g. tire width and tire rolling resistance are not. These are the inputs for for tire calculators like Silcas’ which means that these calculators are not in fact good tools for determining optimal tire pressure.. inconvenient truth that each individual tire appears to have characteristics that make higher or lower pressure faster or slower.. cannot make generalizations.. my hypothesis is that this is due to a particular tire of particular size having its own resonant frequencies that make impedance assumption about impedance losses not as predictable as you might assume.. so in fact the only way to know the optimal tire pressure for a tire on a particular surface is to test THAT on THAT surface..
Thanks Dylan for sharing. Quite fascinating. We were debating this issue recently in our cycling club. I shared your video with our members. We may all be faster next weekend LOL
This was awesome. I really learned a lot of things from this discussion that I don't really hear anywhere else. Thanks for sharing. And I'm definitely going to check out that podcast.
Interesting different format/directions for a video on your channel. Personally my take on this specific question is that I used to worry about tyre selection and tyre weight and tyre pressure in terms of maximising my speed… until I realised that it was all pointless and the one thing that cost me the most time was simply avoiding punctures. Now I just run as bulletproof a setup as I can get and cover ground both faster overall and with less annoying stoppages/mechanicals. Perhaps marginal gains in rolling resistance matter more to pros who have a team car and can simply swap wheels/bikes if they puncture but for the rest of us it does seem to make more sense to simply aim for avoiding mechanicals and all other considerations really are secondary or irrelevant
Tubeless solved the puncture problem years back. I've ridden 28mm road tyres on brutal MTB type terrain and not exactly tentatively either, sometimes it's chasing KOMs. Though I swapped to light 33mm CX tyres after realizing they were just as fast on road, and obviously faster/more comfortable on rougher stuff.
Very interesting video, However I would like to add two other consideration for tire pressure. 1. Higher pressure makes descending more stable\ 2. Higher pressure is more puncture resistant when biking on more marginal roads, that have potholes. To me that is a big consideration not be stranded with a flat tire on a remote road
Nice talking. It make me think that FMB try to make his tires thiner and softer. Many Paris-Roubaix were win with them from 2008 to almost 2015 I think ! I love the way your talking about de foam that is being push and don't have the time to reform so you just "hit the rigid". More you have a tire which filter the vibration of the road, less you loss watt
Dylan, loved the content but I actually love the typical format of scientific analysis with a touch of personal perspective. Either way will keep watching! Best mtb training info out there.
Selecting the right chain lube can save 1.1mph based on my last ride. I just bought a specialized Roubaix sl8 comp. Im in love! Its been on 3 rides. 1 shakedown ride, then some adjusting, then a second ride. After the second ride i converted my drivetrain over to wax, degreasing everything and waxing the chain. And i just got back from my 3rd ride. My 1st ride averaged 14.5 mph. But i was tinkering with the computer on and spinning around the block a couple times. My second ride was the 1st real ride. After giving myself a makeshift bike fit (fixed my pain!). The 2nd ride I averaged 15.2mph over 20 miles. Then i switched to wax, got a spare tube for a longer ride, and i was off. 40 miles later i had averaged 16.3mph, a 1.1mph increase while also doubling the distance. It was my first time hitting 40 miles, its been a goal for so long i lost track. I got close months ago when i was new to biking, but my body wasnt ready and i was trying far too hard i came home @ 38 miles stoked to be so close only to find i popped a blood vessel in my eye. I gave up the goal for a while and learned about zone 2 training. Next goal is 50 miles! I almost pushed for it today...😅
Interesting format. I‘d love to see more, especially on the MTB side. I plan to race XCM again this years after a long break and on a 5 or more hour race a few watts saved make a difference.
Wow, amazing video, very well explained. Would be interesting to make a video about different tyre puncture protection and their cost in watts (for road if possible) and if it's worth it, for example vittoria cinturato velo tlr, as i found on bicyclerollingresistance those tyres are the most puncture proff yet not the lowest rolling resistance as they were expected at that puncture score.
If you are looking to take your training to the next level then consider one of my online science based training plans available here: www.trainingpeaks.com/coach/dylanjohnsontraining#trainingplans
If wider tires have lower rolling resistance and assuming this does not apply to bicycle tires only, then that means putting wider tires in cars can actually improve efficiency?
Oooooooooooooooo
@@sepg5084 oooooooooooooooo ooooooooooooooooooooooooooooooooooooooooooooooooopoooopooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooopp
@@sepg5084 as it was said in the video, there is a limit in both directions. As far as i know, car tyres are already very very wide as the are optimised for grip, not for rolling efficiency. Look at the electric car tyres where efficiency (= range) is critical, the are much thinner :)
Let me know if you liked this style of video and if I should include more guests in the future. There is a lot more from this conversation that I plan on releasing.
Find your optimal tire pressure with the Silca Professional Tire Pressure Calculator:
silca.cc/pages/sppc-form
Find out which tires are faster or slower with BicycleRollingResistance.com:
www.bicyclerollingresistance.com/
Great content. Thanks. I am going out to lower my psi. lol
Great information and insight into tire/tube air pressures. Very interesting and educational. Thanks for this excellent material...
Hi Dylan, I very much enjoyed this style of video. I was hoping Josh/you would get into discussing the pros/cons of various tread types & tire manufacturers. I've been on nothing but Rene Herse tires for years -> Barlow Pass 38mm slicks which actually measure 43mm on my FSE 27mm internal width wheels... However, I've had my eye on some Vittoria tires as well. Thanks again for the great content!!
Your normal videos are better.
Bro you left me hanging! I wanna hear the second part
This is great. I love hearing people who know what they're talking about address issues that we usually don't have any good data on
There's lots of good data out there and has been for the last couple of decades. Guys like Tom Anhalt have been testing tires for the longest time...
Id say the big guys are actually working for the rubber producing companies like maxxis but for sure its great insight although i would have loved context on especific tire recomends and pressures for different types of riding?
Hard choice when there is 490,000 tire options
I got a new bike! I ran 25mm tires at 120 psi on my old bikes for many years. My new bike came with 32mm tires. I used a tire pressure calculator and I currently run them at 55/60. I don't think these tires roll faster, but they are much more comfortable on the chip seal road surfaces I ride around here. I'm old, so comfort is a priority.
Thanks Dylan I am one of those guys that ran as much pressure in my tire as I good back in the day. (1980) Know that I am a bit older (68) I can use every bit of help I can get. LOL I've been running lower pressure for years and it helps make the ride more enjoyable and at the same time faster. Good tires at the right air pressure, the best chain you can afford, best chain rings and cassette, then bearings and a frame that allows the peddle stroke to move the bike forward with no energy loss. With that in place we have NO Exceuses. Ride hard and with passion. Rick
I hear ya, I’m 68 also, raced bikes in 76, and mountain bikes in the 90’s. I always used 110 in my sew ups for races on the road. Now I use 100 lbs. in the rear, and 90 lbs in the front (700x25 clinchers) for rides. My mountain bike I use tubeless tires at 35 to 40 lbs. hard tail with 110mm Fox front shock. I still love to ride regularly.
This was so useful. Used the linked calculator and found I was about 10 psi too high. Let the excess air out and sure enough the bike feels much better and no noticeable change in speed over the last 3 weeks. Thanks Dylan + Josh 😃
Josh is amazing and definitely knows all the details and has all the experience working with cycling teams and testing products. I buy Silca products because of his insight.
I've been buying Silca products LONG LONG before Josh took over (I have an orange Silca Pista floor pump, and an ancient Silca Impero frame pump from over 52 YEARS AGO, when I first started racing on tubulars, both still fully functional!!).
But yeah, this man most definitely knows his subject matter, and then some!
(He might even be able to change my old school, died in the wool
I remember when Vredestein sold road tires with their advertisement that you can pump them up to 150 psi for decreased rolling resistance. It is interesting how things have changed.
Track Riders 150 to 200 psi
I always Ride @ 120 - 125 psi Clinchers Specialized Training Tyres
@@Robert-mn8gc too much
@@Robert-mn8gcwell, Dygert just won the pursuit at worlds running tubeless 25mm tires that were probably under 90psi
@@veganpottertheveganuh...no. 150+ psi more likely
@lunam7249 no, the beads would blow on the tires they used at 150psi sitting still. No way could they handle the force of the banks on the track
This style of video is a nice change of pace from the regular "what do the studies say" videos. I like both styles.
Great content. Great guest. Love the MG podcast. Please consider a conversation with Jan Heine, Rene Herse. If I recall correctly, Josh has hinted on the MG podcast that he may disagree with some of Jan's findings/testing/data on wider tires not being slower. If you could get a full length panel discussion with both of those guys - THAT would be gold. Keep up the good work, Dylan.
I definitely agree. It's hard to have a conversation about low tire pressure and rolling resistance without mentioning the huge contribution of Jan Heine!
Needs an interviewer who knows what he's talking about. Let Backwards Hat Dylan take the next one.
Seriously though, great video!
Love love love this content. This channel is all about getting faster in a practical data based way. Give us more!
Right on! We ALL have left countless watts on the course because of this. I found the insert discussion especially valuable! A deeper dive on this would be great! 👊🏻💥
I was drawn to tire inserts (Vittoria Airliner) for a 28mm road bike rim. I don't compete, but I was looking for added confidence that my tubeless setup would not leave me stranded in a rural area - - where I live. At the time I was running Continental GP 5k (TL), and they were notoriously hard to acquire, and even harder to mount. The Airliner just made it impossible for me.
I never tried the insert with the Pirellis that I used to replace the GP5K's, but these are much easier to mount. In the end, with this new ease of installation, I have abandoned the inserts for the road bike, in favor of carrying a few patches, a boot, and an innter tube.
Really enjoyed this. So many interviewers love to jump in and take the show. But this was an interesting dude and you kept the convo moving forward. Loved it.
This is a must podcast ! Can’t wait for the rest of this conversation.
Definitely think you doing a podcast is the way forward !!
Very interesting! As a downhill/enduro bro, I actively look for a tyre with high hysterisis to keep grip on trails. Michelin tyres are a great example; very low durometer, very slow rebound. Those characteristics keep the tyre from feeling bouncy or "pingy" when riding through fast, chunky sections.
After looking into the TIRE PRESSURE CALCULATOR and seeing how low the suggested tire pressure should be, I'm very enthusiastic to try it out! It's pretty sweet tool. Thank you for the insight!
u will regret it when u hit a pothole at high speed. Bye bye to ur carbon rim.
@@ighfirlee If I were to worry about damaging my bike, I would ride slow, flat, boring tail trails... However, I can't worry about that! I would rather have the traction to make the turn and grip to dirt accordingly! Plus, my ENVE carbon rims have a lifetime warranty :) Ride On!
I like the discussion. Remember years ago, seeing a set of roll down tests of different tires and pressures, and a 'quick and dirty' correlation between how easy it was to deflect the UNINFLATED tire on say the sales rack and the rolling resistance; the easier to deflect, the easier to roll. Goes along with the hysteresis losses examined in the vid. Not foolproof and lots of qualifications but workable.
Jan Heine from Rene Herse Cycles was describing this 15 to 20 years ago and got a lot of flack for it. He did a lot of test with power meters and also with different tire width to prove his findings. Still today there are riders who still believe in maxing out their tire pressures and has still yet to figure it out. Great video, I have heard Josh Poertner talk about this in the past and together with Jan Heine.
Why would publicists take any interest in the arcane intricacies of bicycle tyres?
Yes, please do more in this style! And definitely let us hear the immediate follow-on from this one. I'm on Tubolight in two different wheelsets per your recommendation and I'm convinced they (insterts in general rather than tubolight specifically) are the most underrated tech in gravel/cx at the moment. It was really fascinating to hear more of the science behind how and why they work and what sets different types apart from one another!
Excellent! Your guest was very knowledgable and articulate
Super interesting discussion. I felt like we could have kept going with the topic. I think it’s nice you’ve brought in industry experts and pioneers to discuss a subject. Would love to see more. Maybe you have podcasts in your future?
Damn, that was just straight up excellent. So robustly and concretely communicated.
Explanations were very understandable and made sense. This content and others that you have shown have helped shift my perspective. That's been very helpful and have provided for a more enjoyable experience on and off the road. Thanks.
I'm a big fan of Josh Poertner! Thanks for having him on the show! 🙌🏻
Awesome video! Dylan you lead the way with science based cycling content! Really an eye opener when it comes to tires and pressure.
Absolutely outstanding video; your contributor Josh was excellent and informative - the perfect mix of technology, application and real-world knowledge.
Yes please release more of this conversation. The insight offered is great and I lost track of time listening to it.
Glad you asked insert question. I’ve been curious
This guy is awesome. Just straight shooting without any garbage P/R words.
I watch this video every season. Idk why but the third time watching still fascinates me.
You’ll be a great curator interviewer of this type of content it’s a great complement to your other work
Great video. Post up the entire conversation. I would listen to the whole thing!
Excellent, having two people talking makes it more entertaining. Very informative!
My experience is that the more expensive lightweight high-performance racing tires seem to be more prone to punctures . They usually have thiner sidewalls and less rubber overall in their construction.
It is. Cheaper tires are always more puncture resistance, at the cost of rolling resistance, comfort (higher TPI) and weight.
They last less too the more expensive they are .
Of course, but it isn't a 1 to 1 correspondence. The Continental 5000S variants for instance are very fast and pretty durable. As you go to tires much faster than that, you need to consider the course, and replace them sooner.
So glad you asked about inserts. Was thinking just that when he was explaining hysteresis 👍🏼 super interesting info, thanks for sharing!
Great content, Dylan I would be a non-stop listener if you had a podcast.
The rheology of tires and the rubber compounds used to make them is so interesting. The balance between elasticity and energy dissipation in polymer systems especially in the context of real world performance is very fascinating to study.
Hi Dylan your my go to guy for everything cycling racing related, your very specific in you videos and all the stuff is 100% related to my cycling,, keep it up, don’t change a thing, your by far the most informative
Unreal stuff. Way too much info that I have been looking at, from the silica wax vs one I'm using, to the vittoria foam inserts added resistance. That man is a wealth of info.
Great conversation,Dylan. On a side note, while understanding this was a completely different setup, the audio of your voice was significantly better sounding than recording in your (assuming) garage. Was much easier to listen to.
So you are confirming something I've been observing for a while but never really checked deeply.
I've been thinking about this loss of energy when going with high pressure on road with loose gravels
Great video. Great guest and information. Format is good and only adds to the content you provide!
This video actually got better as it went along. Thumbs up!
Loved hearing Josh talk tires!
Great Video. I enjoy that you vary the style of your videos. The scientific-paper ones are nice, but interviews and alternative approaches to topics really spice up your channel. I like it. Also: Great topic here
Yes,more like this please Dylan.
Great vid. Look forward to the rest of that conversation!
Adding some diversity to the channel format is good. We all enjoy your scientific format, but branching out can be good, and I found this chat interesting.
Maybe once the race calendar starts you might want to do a video with some of the new teammates. Unbound pre or post race video with The jukebox crew.
This was the excellent, please keep providing this type of content. Thanks!
Just the little intro clip with the pressure calculator was new to me. Thank for that .
Fascinating would love to hear more about tire inserts.
This is what I like the science and engineering part on how to be more efficient and faster . In this case it's about rolling resistance and how to maximize that to a riders advantage . That's why constant tinkering can help to improve performance . It can be 30 percent or more of your overall effort figuring things out . If not your wasting your brain power and just focusing on athleticism . Now some ( not many ) can rely on that but most of the rest will have to find an advantage to keep up .
I'm so glad you asked about the inserts. (I was not surprised you did though!) I don't think I've ever heard authoritative, objective information on them before.
Hi Guys, I like your talk about tires and tire pressure. Because of it I tell you what are three players which influence RRC on the smooth drum: hysteresis, deformatin and volume of material
Those tree players have in paralel impact to: wet grip, robustness, footprint, stiffness - > effect: grip, durability handling &comfort.
Good balance of tire design or selection is key to success 😊
most informative bike video of the year.
Dylan, Really good video. Your training videos are the best but introducing other topics/styles such as this is really interesting. Great to learn from experts.
So the days of two people putting as much force into their pumps to get 150 lb into 23 mm tyres have gone .I m thankful for seeing this vid.Used the Silka tool and lowered my 25 mm s to 80 lb and I m not only more comfy I ve already beat my 30 mile time on my usual course plus I m too bothered about bad gritty roads now .Handlebar buzz also nearly all gone
Love the bike on the stand back there. Huge Lemond fan here growing up. I'm very intrigued by all this lower pressure stuff. I remember putting 140 psi in my 18mm Conti GP4000's back in the day, and I had that Silca Track Pump too, haha.
Same ... back in the day (30 years ago - heck!!!) I was running 18mm Conti GP's at 120psi, on my Mavic Open Pro rims ... boy did they sound lovely on my local 10 mile TT - was doing 21 minute 10's back then (not now 😔) ... god knows what I would have done on one of todays aero bikes ...
This kind of detail will save a lot of tears and guess work. Great stuff👍
Fascinating discussion. Thanks. It was surprisingly informative and interesting even though I no longer race.
Awesome video! Great to hear an expert talking tech
Your video helped me to understand the 'why' behind the what better than others have. I knew that a 'more supple' sidewall helped reduce resistance. Now I have a better sense for why. That's cool and thank you.
I'm really happy that I found your channel ! The content is super interesting !
This was awesome, he was talking to us and not "at" us, very clear and super interesting
Great video. Please do one solely focused on mountain bike tires! Thank you!
I liked the commentary. I'm glad you found someone with experience and an open mind to change. Josh Poertner strikes that balance of modern thinkers in an industry sometimes that is stuck in its ways. It was refreshing to hear someone state that comfort and traction are real considerations. It was also nice to hear that he agrees that roller tests do scale to real world results. Arguing that there is little or no value in roller tests is the new vogue of the retro grouch.
Finally, my take is that the product mentions were relevant, and I didn't feel he was a shill for one company or brand. Nice.
Exactly...as long as you stay below the "breakpoint" pressure for a particular tire/load/speed/surface, the results scale exactly. In fact, that's how the "breakpoint pressure" was first identified, i.e. the pressure at which the roller data diverged from the field test data...which, of course means that as long as you're prudent about pressures, they're a valuable (and relatively easy) testing methodology.
Super interesting! Back when I was working in a shop it was all about the highest psi possible. If you ran lower, it was just for comfort.
Pushing the limits of nerdy content. Love it 😁
Yes, this was a helpful video and my tire pressure was too high 10 PSI in the front and 20 PSI in the back.
If you are on a track having high pressure and thin tires is the way to go. However, on the road with thin tires may be fast but if you get flats your gain is not worth much. I went on a bike ride and I saw other riders getting flats left and right and I did not get any flats. I think due to poor tire selection that many riders were getting flats and it took them out of the ride for a chunk of time.
Bro I would watch the whole podcast, post it up!
You make the best stuff ... thanks and keep it coming!
Great video. As someone obsessed with gravel tires, this was very insightful.
Thanks for this. I needed to pause periodically to take notes
That was very interesting Dylan excellent job.
this is so cool and I love how technical it is
Definitely enjoyed this style of video and came away with some good takeaways.
Thank you for this video. The knowledge about the tires really helped me.
Awesome video with a lot of good info, looking forward to more
This was really interesting! I had wondered if the Vittoria inserts were worth the cost, and now I think they might actually be.
Proceed with caution.. haven't experience myself, but word is that these inserts are great functionally.. but make removal of tire almost impossible... reports that teams that used them literally cut tires off to remove rather than trying to pry them off with levers 😳
I've had no issues with my Vittoria gravel insert. I only installed one on my rear wheel since I didn't want to spend for both wheels. They were really easy to install. Basically just like an inner tube. They give me that extra piece of mind when I do rougher trails and small jumps on the gravel bike. I'd say it's worth for the rear wheel. 😊
Good Stuff, I just bought one of these Vittoria inserts to try on the gravel setup here soon. So glad to hear he gave some real world info on it.
One of the best and most tecnical videos about tires I have ever seen. And from my experience I agree 100%. On the Silca link I miss the rim width variable and afew more details like disc or rim brake, comfort average or performance and also dry, mixed or wet surface, that in the old “my mavic” app were. But still very sweet link
To be fair, it asks for "measured width" of the tire, which takes into account the effects of rim internal width (i.e. how it affects the width of a particular tire when mounted). Brake type doesn't have any appreciable effect on the pressure requirements either.
Super, more of these, please!
I definitely would love to see more of this kind of videos!
This is awesome. I am a tire-phyle and eat up this kind of information. Thanks...
Great video.. really love Josh.. he really thinks outside the box and challenges the general consensus.. WHICH IS AWESOME!! I’ve followed his and Tom Anhalts thinking on this in great detail.. all great stuff!
VeloNews’ did an analysis where they used a air shock as stand-in for a ‘flappy meat bag’ (aka a rider 😀) not sure everyone noticed, but if you look carefully at data it actually demonstrates that some of the attributes that you might assume would be predicted to be correlated with optimal tire pressure e.g. tire width and tire rolling resistance are not. These are the inputs for for tire calculators like Silcas’ which means that these calculators are not in fact good tools for determining optimal tire pressure.. inconvenient truth that each individual tire appears to have characteristics that make higher or lower pressure faster or slower.. cannot make generalizations.. my hypothesis is that this is due to a particular tire of particular size having its own resonant frequencies that make impedance assumption about impedance losses not as predictable as you might assume.. so in fact the only way to know the optimal tire pressure for a tire on a particular surface is to test THAT on THAT surface..
Thanks Dylan for sharing. Quite fascinating. We were debating this issue recently in our cycling club. I shared your video with our members. We may all be faster next weekend LOL
This was awesome. I really learned a lot of things from this discussion that I don't really hear anywhere else. Thanks for sharing. And I'm definitely going to check out that podcast.
This was fantastic. More please.
This was amazing. Very much appreciated an additional expert to cover such a topic.
awesome video with a lot of insights, keep them coming!
Loved it. Smart and engaging, and I leaned quite a bit.
Interesting different format/directions for a video on your channel. Personally my take on this specific question is that I used to worry about tyre selection and tyre weight and tyre pressure in terms of maximising my speed… until I realised that it was all pointless and the one thing that cost me the most time was simply avoiding punctures. Now I just run as bulletproof a setup as I can get and cover ground both faster overall and with less annoying stoppages/mechanicals. Perhaps marginal gains in rolling resistance matter more to pros who have a team car and can simply swap wheels/bikes if they puncture but for the rest of us it does seem to make more sense to simply aim for avoiding mechanicals and all other considerations really are secondary or irrelevant
So whats your pick?
@@romelagz Schwalbe Marathon Plus SmartGuard? :)
Tubeless solved the puncture problem years back.
I've ridden 28mm road tyres on brutal MTB type terrain and not exactly tentatively either, sometimes it's chasing KOMs.
Though I swapped to light 33mm CX tyres after realizing they were just as fast on road, and obviously faster/more comfortable on rougher stuff.
Very interesting video,
However I would like to add two other consideration for tire pressure.
1. Higher pressure makes descending more stable\
2. Higher pressure is more puncture resistant when biking on more marginal roads, that have potholes.
To me that is a big consideration not be stranded with a flat tire on a remote road
Nice talking. It make me think that FMB try to make his tires thiner and softer. Many Paris-Roubaix were win with them from 2008 to almost 2015 I think ! I love the way your talking about de foam that is being push and don't have the time to reform so you just "hit the rigid". More you have a tire which filter the vibration of the road, less you loss watt
Dylan, loved the content but I actually love the typical format of scientific analysis with a touch of personal perspective. Either way will keep watching! Best mtb training info out there.
This guy is gold!
Selecting the right chain lube can save 1.1mph based on my last ride.
I just bought a specialized Roubaix sl8 comp. Im in love! Its been on 3 rides. 1 shakedown ride, then some adjusting, then a second ride. After the second ride i converted my drivetrain over to wax, degreasing everything and waxing the chain. And i just got back from my 3rd ride.
My 1st ride averaged 14.5 mph. But i was tinkering with the computer on and spinning around the block a couple times. My second ride was the 1st real ride. After giving myself a makeshift bike fit (fixed my pain!). The 2nd ride I averaged 15.2mph over 20 miles. Then i switched to wax, got a spare tube for a longer ride, and i was off. 40 miles later i had averaged 16.3mph, a 1.1mph increase while also doubling the distance.
It was my first time hitting 40 miles, its been a goal for so long i lost track. I got close months ago when i was new to biking, but my body wasnt ready and i was trying far too hard i came home @ 38 miles stoked to be so close only to find i popped a blood vessel in my eye. I gave up the goal for a while and learned about zone 2 training. Next goal is 50 miles! I almost pushed for it today...😅
Interesting format. I‘d love to see more, especially on the MTB side. I plan to race XCM again this years after a long break and on a 5 or more hour race a few watts saved make a difference.
Wow, amazing video, very well explained. Would be interesting to make a video about different tyre puncture protection and their cost in watts (for road if possible) and if it's worth it, for example vittoria cinturato velo tlr, as i found on bicyclerollingresistance those tyres are the most puncture proff yet not the lowest rolling resistance as they were expected at that puncture score.