@@256shadesofgrey The chainline would be so horrible with 75/52 that I'm not sure you would be even able to shift into that gear unless you would have EXTREMELY long chainstays.
A big chainring needs a casette with a big range too, i actual have a small 70 tooth chainring with 11-52 casette, i change the chainring soon to an 80 tooth 🤪
Longer crank increases the circumference of your pedal stroke, reducing the number of revolutions for a given time period. Also closes the hip angle compared to shorter cranks. Shorter cranks allow for higher cadence, thus having the effect of a lower gear ratio in terms of how much stress is put on your muscles. A longer crank helps when you need torque to loosen the crank bolt.
I changed my gearing 6 month ago on my e bike, (i have poor lungs now (C.o.p.d)aged 62)because of ghost peddling, best ratio available on back was 11gears 11 to 36 and front 60 tooth crank wheel. Running on fat tyre 26 inch wheels so could in theory go bigger on front. It is set up for a double crank wheel 60/46. But I have yet to need the smaller 46. Motor copes with any hill. I use pedal assist 90 percent of time. Electric has kept me able to still ride.
Since you wrote HPV, was this in a streamliner or velomobil? How long did you hold this speed? If I remember correctly, there was a one hour record with about this speed. Am I right?
@@LaomerKedor , it is a streamliner. it is an “ upright “ or normal bike position. the speed I quoted is for the flying 200 metres. my hour speed was about 40+ miles an hour at the time. now, recumbent hpv’s are dramatically faster than this. ( I haven’t checked lately)
So the ideal setup for this front ring would really be a MTB cassette with large uphill rings aswell as small rings, a road cassette is pointless with any incline. It would be great on a recumbent where aero drag is much less.
That sounds ridiculous and fun. 75-52 ratio isn't all that bad, all things considered, and you still get the 75-11 or 75-10 for top speed! That said you're still going to feel quite a bit more resistance with having to haul that enormous amount of chain up and over such a huge ring, but hey, it'll look wild. :P
The ideal placement for this chainring is alluded to at 03:45 - on a small wheeled bike like a folder or recumbent to offset the lower final drive ratio.
@@l.d.t.6327 Thanks for the heads up. Saw an example here in UA-cam. As far I remember this guy in Brazil use a "conventional" setting with one giant chain ring.
Really enjoyed the format and structure of this video (both lads working together in the workshop overcoming challenges, less presentational at times etc.) so hope this style comes back again!
Actually, one of these with a MTB 10-51 cassette at the back would be pretty decent. The climbing gear would still be 1.5, but its not that in the grand scheme of things. Actually better than 39-25 people were running not long ago. And a 75-10 would keep up with highway traffic
the 75-10 doesn't make you any faster - and for sure not to the speed of high way traffic. Humans simply don't have the power to use them. For 100 kph you need 4000-5000 W (depending on how aero you are); and even in a steep downhill... when you would reach 96 kph freewheeling you would need about 400 W to reach 100 kph. Makes no sense at all
I see potential for an even bigger chainring. I'm thinking, compound gear systems! Where the pedals are connected to a smaller internal gear that drives the large outer chainring. Getting a torque multiplication effect, making it easier to turn the large chainring and allowing for an even bigger blade!
If you use an underdrive gearbox to drive the big chainring, what would the beg chainring be for!? 😅 But yes, you can use a Schlumpf Mountain Drive for that. It's a small gearbox that sits between the cranks and the chainwheel. It has a direct 1:1 speed and a reduced 2.5:1 speed. (Other models are Speed Drive and High Speed Drive with 1:1.65 or 1:2.5 overdrive.) With the Mountain Drive you can use a large chainring for fast riding and still have easier speeds available for uphills. 75:2.5 is 30, so the resulting speeds are really quite manageable. Schlumpf Drives are well known in the recumbent community. (Our cycles, especially the velomobiles are often fast in the flats, but heavy uphill. Normal shifting systems often don't have enough gear range for that.)
Great vid! I used to have a 61 tooth chainring on my bike. Impractical but got some funny looks and comments. Doing 20mph in first gear was always interesting.
There was a guy - Nic Bowdler - who used a TT bike with a 77T chainring. I remember him passing me on the Bentley course (I think it was a 50) like some sort of stealth weapon.
The 75 tooth chainring would give you an advantage in many Strava downhill segments. But how do you get up the mountain? You would need a small 60 chainring and a classified hub gear, although the large chainring does not have a climbing rivet for the chain. Then you would have 48 gears.
Pretty interesting too that the reason they could not reach the chainring top speed is the main advantange of a velomobile: better areodinamycs (lower drag) which in turn makes it more efficient at higher speeds in exchange for a lower acceleration (increased weight) in comparison to a bicycle.
I remember back in the eighties when Dave Legrys attempted the landspeed record. His chainring was much bigger and he needed a Rover 3.5l to drag him up to speed. He actually used a section of motorway to do it on. We also had big chainrings on some of the club (Harlow CC) roller bikes.
I think 54 tooth chainring its like the optimal for a road bike, more than that, it starts to turn into track bike, but you dont have climbs, traffic, and so
I'm turning my gravel bike into a more-of a road bike. I still really enjoy the 1x system, and there are no hills THAT crazy in my city. I'm going from a 40t chainring / 11-42t cassette to a 44t chainring / 11-36t cassette. If ever I come to an ascent I can't manage - I'm 110% certain this video will pop-up in my head.
You are very correct, it's very simply a bigger lever, which will make it easier to get going. Imagine trying to get this going with smaller cranks, you could almost mount a pedal on the side of that chain ring :D.
Itb is interesting that as the diameter of a chainring increases, the force on the chain links diminishes, thereby reducing frictional losses in the chain. Time to take this bike to the Silverstone rig to measure the savings! Recumbent enthusiasts and engineers realized the advantages of large rings along time ago and have favoured this approach when designing HPVs intended to reach speeds as high as 130 kph. 75 teeth is actually way too small for a fully faired HPV, but it would work well for an unfaired recumbent. I will be using a similar sized ring on my new unfaired recumbent TT bike next spring.
Thanks for doing this!! I'm older and dealing with some health issues and there is a possible use case for a larger chain ring in some situations. In the USA we have more space and much more lenient enforcement of E Bike class rules especially in the suburbs and country roads. I like to pedal hard with assistance and since it's hot where I'm at, I could use a slightly taller (larger) front chain ring. But your test shows that there's a point of diminishing returns dealing with wind. So thanks again for doing this. Based on your experiment I'd probably add just 2 or 4 teeth to the front ring.👌🏻👍
Crank length doesn't affect gear ratios, but it changes the leverage you have to turn the gear. A longer lever arm gives you more leverage for turning a (58 inch?) gear up the hill. Niche application: small drive wheels.
Dr. Bridgewood was so right about "some niche applications" to exist. This video is living proof that at least one application exists. It unequivocally proves that the statement "not all heroes are idiots" is fully reciprocal.
My Di2 gears packed in due to extreme heat over in Mallorca one year, locking me in the 52/11…! I had to get from Over Murro back to Palma Nova😂 I looked just like Olly on the flat, and i kind of got into it as you just batter on with what you’ve got😳😂 Then came the climbs and the weaving around, just crazy and my legs were over due to explode and minute. I remembered a bike shop on the edge of Palma and begged them to help me out as bigger climbs were afoot to get home. They kindly stripped out the wires, found no faults, put it back together and it just started up working again!! Defo the heat i think. Got back home ok but it then packed up again a few days later. I cooled off the bike in an air conditioned sympathetic garage and hey presto it worked again!! It was around 34 degrees and would be hotter inside the frame i guess with the sun beating down. Have you ever had this with Di2? It was Dura ace 3rd gen woth the clever battery. Cheers.
drop down to a 61/57T. Also upgrade the rear derailleur with a 11-46T if using the 75T front Chainring. This should make up for the easy to pedal feel and speed. Larger front Chainrings is only beneficial if used correctly with gear selection of the rear cogs or going downhill. If you're on a flat surface then selection of the rear cog should be somewhere between 16-23T (comfort). And if you want to speed then 11T rear cog preferably. If your quads is capable of handling the harder Candence.
Worthy test for every future GCN presenter. Makes me glad don't live anywhere near you, though I felt like I attempted a similar challenge on the hills above Oakland California near San Francisco.
I was at a ski resort yesterday with a lot of MTB off-road downhillers around. The bikes, however, all seem to be geared for extreme climbing. One of those rear cassetes with the huge low gear cog would be interesting with this chainring. You’d need the second chain for sure though.
Yeah that's a monster. And yeah, it was fun to watch. Some world tour riders could find a legit use for it, certainly. Not me, I'd enter cardiac arrest.
Air resistance at high speed is not the only thing. Most people don't realize this but at high speed you ara a system that contains a lot of energy (kinetic energy). And therefore to change your velocity, you have to add a lot more energy to change the same amount of speed. To give a simple example, going from 1 meter per second to 2 meter per second costs you 1.5 joules per kilo system weight (1/2 times velocity squared), whereas going from 11 meter per second to 12 meter per second costs you 11.5 joules per kilo system weight (144/2-121/2). So to change te same amount of speed, in this example 1 meter per second, you have to put more energy in the system, which takes more time if you can only produce so much power.
I run a 52 -14 on my track bike, 54- 16 on my FIXEDGEAR, and a 2x with a 56 chainring and a 9 speed cassette with a 11-23. If you ruñ shorter than what you normally run it will work. Nice you figured out the clearance. 🌀🌀🌀
My road bike has double 54t/42t chainrings and 11t-34t rear rings, which is more than enough for me, and I've never run out of rings on either side. Chainrings with 75t are only for making fun videos like this.
I have current upped my gearing to 53t and the speed gain ( maybe it’s a placebo effect ) on the flat is amazing 🤘🏾🤘🏾 I did see a 54t DA on a website for sale and was thinking about bidding for it but changed my mind last minute and say maybe 53 is good instead of going crazy lol
3:15 in fact the opposite is true, having longer cranks gives you more leverage and thus an effectively lower gearing. imagine going down hill with the 75t chainring with 165mm cranks, you would be able spin faster than with 180mm cranks. LONGER cranks means LOWER gearing. so for the purpose of this video, the 180mm cranks actually does't make a lot of sense.
There is nothing new under the sun. TA did a 68 tooth chainring back in the early 60s. I rode up and down all the big hills in Bath with a 23t largest sprocket. I glazed the Mafac brake blocks coming down Wellsway. Toe clips and straps of course. I was only 17.
How does increasing the crank length change the gearing? You rotate the cranks once and 75 teeth go by regardless of the crank length. You have more leverage with longer cranks but the relationship between pedal rotations and wheel rotations remains the same, surely?
...last time I made 74km/h (downhill of course xD) on my 50x11 tiagra on Giant TCR and I was spinning like crazy I'm 100% sure that its easier to spin crazy fast for longer than spin hard btw love your channel and greetings from Poland!
I think this could potentially be useful for an ebike with a mid-drive motor. I would LOVE to see you guys pop that crank on an ebike and hit 100 mph on a bike!
That chainring was probably designed for a custom made recumbent that is enclosed that will allow a rider to hit 130-160km/h because of little drag and wind resistance.
I have the 69T version of that chainring. I cut shift ramps and added shift pins to it and made a 52-58-69 triple. Moved the FD up and trimmed the cage to shape. Rear is 7 speed 14-28. 8 speed chain. Big ring shifts perfectly.
@@pierrex3226 I couldn’t get past 60km/h with the 52T and 14 sprocket and I had custom painted the bike frame, wheel rims and hubs so I wanted to keep the wheels. Easiest solution was to put on a bigger chainring.
I use a 75-tooth and Schlumpf Mountain Drive (2.5 reduction in low range) with an 11-50, 10-speed cassette on my velomobile. It allows cruising at 55-60km/h on flat ground and 80-90km/h on the downhills.
my ebike is so fast the gearing it came with is useless at top speeds, with a chainring like this i could be able to contribute at the top end :+D amazing video !!
I can imagine that the chainring might suit a single speed/fixed gear providing you also increase your sprocket size - a 50/16 up to 75/24 - same gear inches but less tight articulation thus saving watts. It would look bonkers though. Or maybe it is used on a recumbent which due to much lower drag can require bigger gears.
The biggest chainring I ever used was on a 105km tandem record ride that included 1000m of altitude lose and a 60kmh tailwind, and that was a 64t ring running onto a 13t smallest sprocket.
I had a 75 on my Brompton which was originally for a recumbent bike. I did race with a 70t in the world Brompton Championships. And on a visit to Royce Engineering Cliff had a 144t chainring.
I had an article come across my feed today! "José Meiffret (1913-1983, born Boulouris, France) was a cyclist who set a world motor-paced speed record of 204.73 km/h (127.243 mi/h) behind a Mercedes-Benz 300SL on the German Autobahn on July 19, 1962 at Freiburg Germany." Google his bike! I think the chain ring might be about twice as big!
That's my fixed gear setup, 75 - 11, I take the Highway to work. On the weekends I win hillclimbing competitions with this setup. The only thing that is hard with this gearing is to resist the temptation to put an even bigger gear on.
My only question after watching the video is this: When Alex and Ollie are watching each other attempt the crazy climb, why do they both stand on the sidewalk like they're on the wall for a penalty kick?
I would love to see them do this again but paired with Shimano’s gravel cassette and derailleur, or better still on a bike with Drivelines 75 tooth chainring, paired up with SRAMs AXS shifters up front and Eagle AXS rear derailleur and cassette, to give a 50-10 rear cassette (assuming they were compatible - I confess I’ve not looked at the compatibility with the chainring and SRAM). See Ollie’s match stick legs power up that hill with a bigger bailout gear!
Sally in the Woods??.....I've got a "haunted" road like that, that was on the route of a fast group ride that I used to do. Its name was Munger Road. Somebody even made a movie about the legend, with its name ("Munger Road"). They even used the railroad crossing as part of the movie. Maybe it was haunted. One guy went down hard, after hopping the tracks, at speed. The speed test achieved only 44 to 45 mph. I can spin a 53x12 at 130 rpm, that fast.
Jemery Clarkson put aerodynamic resistance in an interesting way years ago with the Veron. "The car only needs 250hp to go 150 mph. But it needs the other 800hp just to go 100mph faster".
Still glad i got 2 x gears on my Gravely commute bike. Small gaps between gears so you can find the comfy one for the slope you're on. Lowest gears low enough. And If i'm going fast enough for my high gear to topped out i'm going fast enough
Would you try riding with a 75-tooth chainring? Or is it just too extreme?
Put a 9-52 MTB cassette on it. 75/9 sounds like fun, while 75/52 will be close to what you have for a climb gear on road bikes anyway.
Could be good on an e-bike. I don't really use my 53-11 so a 75 is too much for me on a normal road bike.
You guys should try that chainring on an electric road bike
@@256shadesofgrey The chainline would be so horrible with 75/52 that I'm not sure you would be even able to shift into that gear unless you would have EXTREMELY long chainstays.
A big chainring needs a casette with a big range too, i actual have a small 70 tooth chainring with 11-52 casette, i change the chainring soon to an 80 tooth 🤪
That's not a chain ring, that's a table saw blade!
don't give em ideas 😂
As long as it’s 3/32, 😂
Or a miter saw blade...😅
Ur dumb
put a 52teeth casset on it
A longer crank should reduce your effective gearing, not the other way round
yep, and a guy with a phd in chemistry should know that. But I guess thats what happens when you have to work and talk at the same time.
@@bergerniklas6647 chemistry has nothing to do with physics, I liked physics way more than chemistry and don't know shit about chemistry either
yes, mechanical advantage
Came here to say that.
Longer crank increases the circumference of your pedal stroke, reducing the number of revolutions for a given time period. Also closes the hip angle compared to shorter cranks. Shorter cranks allow for higher cadence, thus having the effect of a lower gear ratio in terms of how much stress is put on your muscles. A longer crank helps when you need torque to loosen the crank bolt.
.
*"You know who's going to hack this...
*...ebikers with hub motors.*
*"But officer, I was going 75 in eco mode.*
to be frank, mid-motor ebikes also accept these chainrings :) mine is actually 110 bcd 5 bolt.
I changed my gearing 6 month ago on my e bike, (i have poor lungs now (C.o.p.d)aged 62)because of ghost peddling, best ratio available on back was 11gears 11 to 36 and front 60 tooth crank wheel. Running on fat tyre 26 inch wheels so could in theory go bigger on front. It is set up for a double crank wheel 60/46. But I have yet to need the smaller 46. Motor copes with any hill. I use pedal assist 90 percent of time. Electric has kept me able to still ride.
Such chainrings are useful for small wheeled bike - like folding bikes or recumbents.
Yes definetly
Oh, you're active. Waiting for new videos!
Unless the wheels are so small the CR drags on the ground.
At that point, that chainring is a third wheel :D
I'm thinking to put on folding bike so be 32.4mph estimate top speed I go, might make single speed depending on where cycle as only need 75-11
on my Alex Moulton bicycle, I used a 60 tooth for general training, and for my world record HPV (51.3 mph-82.5 kph) I used an 86 tooth chaining
Did you now?
Since you wrote HPV, was this in a streamliner or velomobil? How long did you hold this speed? If I remember correctly, there was a one hour record with about this speed. Am I right?
@@LaomerKedor , it is a streamliner. it is an “ upright “ or normal bike position. the speed I quoted is for the flying 200 metres. my hour speed was about 40+ miles an hour at the time. now, recumbent hpv’s are dramatically faster than this. ( I haven’t checked lately)
Got to appreciate Alex embracing the 'I've got Dura-Ace chainsets coming out of my ears' meme 🤣
So the ideal setup for this front ring would really be a MTB cassette with large uphill rings aswell as small rings, a road cassette is pointless with any incline. It would be great on a recumbent where aero drag is much less.
That sounds ridiculous and fun. 75-52 ratio isn't all that bad, all things considered, and you still get the 75-11 or 75-10 for top speed!
That said you're still going to feel quite a bit more resistance with having to haul that enormous amount of chain up and over such a huge ring, but hey, it'll look wild. :P
The ideal placement for this chainring is alluded to at 03:45 - on a small wheeled bike like a folder or recumbent to offset the lower final drive ratio.
A guy in Brazil used a 100+ chain ring in his bike when breaking the speed record in a road with the help of a wind shield behind a car.
Those guys usually use 3 chainrings in front: a very big one, a small one connected to another big one and next the cassette.
@@l.d.t.6327 Thanks for the heads up. Saw an example here in UA-cam. As far I remember this guy in Brazil use a "conventional" setting with one giant chain ring.
Really enjoyed the format and structure of this video (both lads working together in the workshop overcoming challenges, less presentational at times etc.) so hope this style comes back again!
Actually, one of these with a MTB 10-51 cassette at the back would be pretty decent. The climbing gear would still be 1.5, but its not that in the grand scheme of things. Actually better than 39-25 people were running not long ago. And a 75-10 would keep up with highway traffic
How my TT is set up, though with a smaller CNC’d 61T…
Yeah i would probably put this on my mtb if it would fit.😀
So realistically would probably have to use gravel/road bike with mtb casette to make it fit.
the 75-10 doesn't make you any faster - and for sure not to the speed of high way traffic. Humans simply don't have the power to use them. For 100 kph you need 4000-5000 W (depending on how aero you are); and even in a steep downhill... when you would reach 96 kph freewheeling you would need about 400 W to reach 100 kph. Makes no sense at all
@@fiddleronthebike ackschually
I see potential for an even bigger chainring. I'm thinking, compound gear systems! Where the pedals are connected to a smaller internal gear that drives the large outer chainring. Getting a torque multiplication effect, making it easier to turn the large chainring and allowing for an even bigger blade!
They do that for the speed records, basically two chains
One velomobilist in my strava feed has an 80 tooth chainring.
If you use an underdrive gearbox to drive the big chainring, what would the beg chainring be for!? 😅 But yes, you can use a Schlumpf Mountain Drive for that. It's a small gearbox that sits between the cranks and the chainwheel. It has a direct 1:1 speed and a reduced 2.5:1 speed. (Other models are Speed Drive and High Speed Drive with 1:1.65 or 1:2.5 overdrive.) With the Mountain Drive you can use a large chainring for fast riding and still have easier speeds available for uphills. 75:2.5 is 30, so the resulting speeds are really quite manageable. Schlumpf Drives are well known in the recumbent community. (Our cycles, especially the velomobiles are often fast in the flats, but heavy uphill. Normal shifting systems often don't have enough gear range for that.)
Love the setting which like in a sit com type of vibes. Really loved it! Maybe try racing the rig to local criterium race?
Yes, they need to race it
Alex comment about Dura Ace cranks was funny AF. If you know, you know
😂😂😂
I know 😅
Was looking for this comment as soon as he said he's got em coming out of his ears
I don't know please explain
@@oblimidon There was a video where he put an old dura ace crankset on his bike for a budget video saying it was only like 100 dollars or something.
Great vid!
I used to have a 61 tooth chainring on my bike. Impractical but got some funny looks and comments.
Doing 20mph in first gear was always interesting.
There was a guy - Nic Bowdler - who used a TT bike with a 77T chainring. I remember him passing me on the Bentley course (I think it was a 50) like some sort of stealth weapon.
Love the style of this vid guys.. just two mates playing with bikes and parts in the garage.. then trying them out.. classic.. Pete 🚴♀️🚴🏻👍
The 75 tooth chainring would give you an advantage in many Strava downhill segments. But how do you get up the mountain? You would need a small 60 chainring and a classified hub gear, although the large chainring does not have a climbing rivet for the chain.
Then you would have 48 gears.
Mountains up by bus 😂
The good old pushing the bike
Just start a the top of a hill and drive down fast enough that you roll up the next hill.
Just use a 9-52 knc cassette
As a velomobilist I can truly confirm, that there are way bigger chainrings than 75 teeth, Man are you joking? 75? I could walk instead.
Was thinking the same although I‘m only riding a 60 because I live in Austria. But I know some riders in northern Germany with 80+
Pretty interesting too that the reason they could not reach the chainring top speed is the main advantange of a velomobile: better areodinamycs (lower drag) which in turn makes it more efficient at higher speeds in exchange for a lower acceleration (increased weight) in comparison to a bicycle.
I think I saw Alex and Ollie going up Bathford Hill to do Prospect Place as I was going down and now I know why Ollie looked really grumpy!
2:37 No, he said bolt hole, kids!
lmaooooo unfortunate accent for that word
boat hole?
@@manoz6194 Boat hoe. (It's for gardening on a fancy yacht.)
I remember back in the eighties when Dave Legrys attempted the landspeed record. His chainring was much bigger and he needed a Rover 3.5l to drag him up to speed. He actually used a section of motorway to do it on. We also had big chainrings on some of the club (Harlow CC) roller bikes.
Good silly fun with a sensible conclusion at the end. Nice work chaps!
I wanna see Feather vs Holmes on that climb with the same setup.
Also, +1 to all those people suggesting they try it with a crazy 50t MTB cassette
I know people who drive such rings on very fast velomobiles. You can make 2x with hand-shifter, just tipping the chain down to the smaller one.
I think 54 tooth chainring its like the optimal for a road bike, more than that, it starts to turn into track bike, but you dont have climbs, traffic, and so
I'm turning my gravel bike into a more-of a road bike. I still really enjoy the 1x system, and there are no hills THAT crazy in my city. I'm going from a 40t chainring / 11-42t cassette to a 44t chainring / 11-36t cassette. If ever I come to an ascent I can't manage - I'm 110% certain this video will pop-up in my head.
wouldn't longer cranks give you lower gear? they give you more torque so you can push the pedals more easily but you lose a bit of speed
@@alf3071 yes
They actually used longer crank, considering height of the rider.
Yes. He has more torque, dont know what he was on about
You are very correct, it's very simply a bigger lever, which will make it easier to get going. Imagine trying to get this going with smaller cranks, you could almost mount a pedal on the side of that chain ring :D.
Your legs on a longer crank would be going faster... just saying.
It's not even a meme any more, Alex really does just have random bits of Dura-Ace laying around everywhere lmao
Glad that your knees survived the climb. Great to see dura-ace cranks make an appearance
That is Bike Vault material. Ring da Bell 🔔
Itb is interesting that as the diameter of a chainring increases, the force on the chain links diminishes, thereby reducing frictional losses in the chain. Time to take this bike to the Silverstone rig to measure the savings! Recumbent enthusiasts and engineers realized the advantages of large rings along time ago and have favoured this approach when designing HPVs intended to reach speeds as high as 130 kph. 75 teeth is actually way too small for a fully faired HPV, but it would work well for an unfaired recumbent. I will be using a similar sized ring on my new unfaired recumbent TT bike next spring.
Btw 75T with 11T at 90rpm with 28C tire is 78km/h. and at 130rpm that is 113km/h only if you have the power to do that.
I imagine, if it is on the flat, at 113km/h either the rear tire doesn't generate enough traction or the front wheel looses contact with the road.
Theres a London cyclist on Strava called "Mean Cycling" he rides this exact crank pretty much on a daily basis and hes fast!!
When Guy Martin did that land speed cycling record he had a crazy setup that he couldn't even pedal from a standstill. There's always a niche.
Thanks for doing this!! I'm older and dealing with some health issues and there is a possible use case for a larger chain ring in some situations. In the USA we have more space and much more lenient enforcement of E Bike class rules especially in the suburbs and country roads. I like to pedal hard with assistance and since it's hot where I'm at, I could use a slightly taller (larger) front chain ring. But your test shows that there's a point of diminishing returns dealing with wind. So thanks again for doing this. Based on your experiment I'd probably add just 2 or 4 teeth to the front ring.👌🏻👍
Absolute cinema for the sunday!
„How about trying to ride your bike with a 75T chainring in a stage of Tour de France?
Victor Campenaerts:
*„YES!!!“*
Crank length doesn't affect gear ratios, but it changes the leverage you have to turn the gear. A longer lever arm gives you more leverage for turning a (58 inch?) gear up the hill. Niche application: small drive wheels.
Absolutely ridiculous video, love it!!! 😂 ❤U👋🏻
I'd like to see the bodybuilder guy you used on an earlier video try it or even Ganna.
spotted the "That's what she said" joke here lmao 5:49
Make Andrew Feather ride it uphill!
Dr. Bridgewood was so right about "some niche applications" to exist. This video is living proof that at least one application exists. It unequivocally proves that the statement "not all heroes are idiots" is fully reciprocal.
My Di2 gears packed in due to extreme heat over in Mallorca one year, locking me in the 52/11…! I had to get from Over Murro back to Palma Nova😂 I looked just like Olly on the flat, and i kind of got into it as you just batter on with what you’ve got😳😂 Then came the climbs and the weaving around, just crazy and my legs were over due to explode and minute. I remembered a bike shop on the edge of Palma and begged them to help me out as bigger climbs were afoot to get home. They kindly stripped out the wires, found no faults, put it back together and it just started up working again!! Defo the heat i think. Got back home ok but it then packed up again a few days later. I cooled off the bike in an air conditioned sympathetic garage and hey presto it worked again!! It was around 34 degrees and would be hotter inside the frame i guess with the sun beating down. Have you ever had this with Di2? It was Dura ace 3rd gen woth the clever battery. Cheers.
Lol electronic shifting is such junk. Can't even handle being ridden outdoors where bikes belong! What a joke
What rings do they ride on the track? There are some big lads with quads like tree trunks.
drop down to a 61/57T. Also upgrade the rear derailleur with a 11-46T if using the 75T front Chainring. This should make up for the easy to pedal feel and speed. Larger front Chainrings is only beneficial if used correctly with gear selection of the rear cogs or going downhill. If you're on a flat surface then selection of the rear cog should be somewhere between 16-23T (comfort). And if you want to speed then 11T rear cog preferably. If your quads is capable of handling the harder Candence.
ok. time to attach this to one of those city bikes with the basket on the front and give it to Hank to try out on Mt. Ventoux
Worthy test for every future GCN presenter. Makes me glad don't live anywhere near you, though I felt like I attempted a similar challenge on the hills above Oakland California near San Francisco.
The Dura Ace jokes will never stop!
Use that 75-tooth on the longest bike record attempt I was alluding to in the "Secret Features of your Shimano Di2 Groupset" ...
I was at a ski resort yesterday with a lot of MTB off-road downhillers around. The bikes, however, all seem to be geared for extreme climbing. One of those rear cassetes with the huge low gear cog would be interesting with this chainring. You’d need the second chain for sure though.
Omg, I’ve never seen anyone else apart from Mean Cycling have this set-up.
...and I think he'd beat both Ollie and Alex up that hill! 😊
Alex holding the light saber precariously at 3:15. LOL.
More crazy videos please 😁
Straight to the bike vault! Ultra Nice!
Mark would love this😂
Yeah that's a monster. And yeah, it was fun to watch. Some world tour riders could find a legit use for it, certainly. Not me, I'd enter cardiac arrest.
Great stuff lads!
Air resistance at high speed is not the only thing. Most people don't realize this but at high speed you ara a system that contains a lot of energy (kinetic energy). And therefore to change your velocity, you have to add a lot more energy to change the same amount of speed.
To give a simple example, going from 1 meter per second to 2 meter per second costs you 1.5 joules per kilo system weight (1/2 times velocity squared), whereas going from 11 meter per second to 12 meter per second costs you 11.5 joules per kilo system weight (144/2-121/2).
So to change te same amount of speed, in this example 1 meter per second, you have to put more energy in the system, which takes more time if you can only produce so much power.
I run a 52 -14 on my track bike, 54- 16 on my FIXEDGEAR, and a 2x with a 56 chainring and a 9 speed cassette with a 11-23. If you ruñ shorter than what you normally run it will work. Nice you figured out the clearance. 🌀🌀🌀
My road bike has double 54t/42t chainrings and 11t-34t rear rings, which is more than enough for me, and I've never run out of rings on either side. Chainrings with 75t are only for making fun videos like this.
I run.
Fifty five sixteen on my fixed gear. I'm thinking about putting a 56 on my titanium in hombernaro.Road bike
Ollie’s new mantra in action: “Just head out with your mates and batter yourselves!”
next you should try the smallest chainring you can find and a mountain bike type cassette with a 50T cog so its a really low gear
Lovely of that van driver to wait for Alex...
I have current upped my gearing to 53t and the speed gain ( maybe it’s a placebo effect ) on the flat is amazing 🤘🏾🤘🏾 I did see a 54t DA on a website for sale and was thinking about bidding for it but changed my mind last minute and say maybe 53 is good instead of going crazy lol
3:15 in fact the opposite is true, having longer cranks gives you more leverage and thus an effectively lower gearing. imagine going down hill with the 75t chainring with 165mm cranks, you would be able spin faster than with 180mm cranks. LONGER cranks means LOWER gearing. so for the purpose of this video, the 180mm cranks actually does't make a lot of sense.
There is nothing new under the sun. TA did a 68 tooth chainring back in the early 60s. I rode up and down all the big hills in Bath with a 23t largest sprocket. I glazed the Mafac brake blocks coming down Wellsway. Toe clips and straps of course. I was only 17.
I used to use a 12-23 cassette, until 8 years ago.
How does increasing the crank length change the gearing? You rotate the cranks once and 75 teeth go by regardless of the crank length. You have more leverage with longer cranks but the relationship between pedal rotations and wheel rotations remains the same, surely?
This is great for recumbents. 20" wheels and higher speed means bigger chain rings (or internal gearing on top of derailer).
need power overlay when cranking up that hill
...last time I made 74km/h (downhill of course xD) on my 50x11 tiagra on Giant TCR and I was spinning like crazy I'm 100% sure that its easier to spin crazy fast for longer than spin hard
btw love your channel and greetings from Poland!
I think this could potentially be useful for an ebike with a mid-drive motor. I would LOVE to see you guys pop that crank on an ebike and hit 100 mph on a bike!
This is great, just a lads day fluffing in the shed (although a fancy one) and trying silly things
Love this mockumentary style of filming, it's like I'm watching a special episode of The Office 📽️
That chainring was probably designed for a custom made recumbent that is enclosed that will allow a rider to hit 130-160km/h because of little drag and wind resistance.
with small wheels
I have the 69T version of that chainring. I cut shift ramps and added shift pins to it and made a 52-58-69 triple. Moved the FD up and trimmed the cage to shape. Rear is 7 speed 14-28. 8 speed chain. Big ring shifts perfectly.
Hahaha. Why though?
Lol what is the use case for this? Do you only ride down mountains on a 1980s bike?
@@pierrex3226 I couldn’t get past 60km/h with the 52T and 14 sprocket and I had custom painted the bike frame, wheel rims and hubs so I wanted to keep the wheels. Easiest solution was to put on a bigger chainring.
I believe that you have won the internet, sir.
why don't you use a 12-23 with a smaller chainring ? lol
I use a 75-tooth and Schlumpf Mountain Drive (2.5 reduction in low range) with an 11-50, 10-speed cassette on my velomobile. It allows cruising at 55-60km/h on flat ground and 80-90km/h on the downhills.
My large chainring is 52t with a 12-25t cassette. There is absolutely no way I would be able to pedal a 75t, except on a descent.
That looks so awesome
my ebike is so fast the gearing it came with is useless at top speeds, with a chainring like this i could be able to contribute at the top end :+D amazing video !!
Ollie's on fire with the "that's what she said" type jokes.
Regarding that hill... can he get it (the bike) up? >.> Yes. Pretty much. Close enough.
I can imagine that the chainring might suit a single speed/fixed gear providing you also increase your sprocket size - a 50/16 up to 75/24 - same gear inches but less tight articulation thus saving watts. It would look bonkers though. Or maybe it is used on a recumbent which due to much lower drag can require bigger gears.
The biggest chainring I ever used was on a 105km tandem record ride that included 1000m of altitude lose and a 60kmh tailwind, and that was a 64t ring running onto a 13t smallest sprocket.
Love the mad scientist lighting, very Dr Frankenstein
I had a 75 on my Brompton which was originally for a recumbent bike. I did race with a 70t in the world Brompton Championships. And on a visit to Royce Engineering Cliff had a 144t chainring.
I see Albert has a nice variety of Dura-ace chainsets in his garage, with that 7800 series
Not Sure If I worked this out correctly but I Think the Top Speed on 75 Tooth Crank with an 11 Rear is 60/KMH 37.2 Mph (Flat Road) 70RPM
@@TESTA-CC yes that seems to be accurate.
Great Wall hanger, have a 62 from the Kamikaze days.
I had an article come across my feed today!
"José Meiffret (1913-1983, born Boulouris, France) was a cyclist who set a world motor-paced speed record of 204.73 km/h (127.243 mi/h) behind a Mercedes-Benz 300SL on the German Autobahn on July 19, 1962 at Freiburg Germany."
Google his bike! I think the chain ring might be about twice as big!
That's my fixed gear setup, 75 - 11, I take the Highway to work. On the weekends I win hillclimbing competitions with this setup. The only thing that is hard with this gearing is to resist the temptation to put an even bigger gear on.
It's great for a pedal boat where u need the extra RPM for the prop! :)
My only question after watching the video is this: When Alex and Ollie are watching each other attempt the crazy climb, why do they both stand on the sidewalk like they're on the wall for a penalty kick?
I would love to see them do this again but paired with Shimano’s gravel cassette and derailleur, or better still on a bike with Drivelines 75 tooth chainring, paired up with SRAMs AXS shifters up front and Eagle AXS rear derailleur and cassette, to give a 50-10 rear cassette (assuming they were compatible - I confess I’ve not looked at the compatibility with the chainring and SRAM).
See Ollie’s match stick legs power up that hill with a bigger bailout gear!
I have that chainring and it is going on my newest e-bike that is arriving later this week.
Try motor paced racing on an outdoor track. You can even reverse the forks to get closer to the motorcycle and reduce aerodynamic drag
Sally in the Woods??.....I've got a "haunted" road like that, that was on the route of a fast group ride that I used to do. Its name was Munger Road. Somebody even made a movie about the legend, with its name ("Munger Road"). They even used the railroad crossing as part of the movie. Maybe it was haunted. One guy went down hard, after hopping the tracks, at speed.
The speed test achieved only 44 to 45 mph. I can spin a 53x12 at 130 rpm, that fast.
I've done more than 80kph pedalling with a 52-12 (downhill, of course!). Souplesse is the key to going quick. ;)
Jemery Clarkson put aerodynamic resistance in an interesting way years ago with the Veron. "The car only needs 250hp to go 150 mph. But it needs the other 800hp just to go 100mph faster".
Still glad i got 2 x gears on my Gravely commute bike. Small gaps between gears so you can find the comfy one for the slope you're on.
Lowest gears low enough. And If i'm going fast enough for my high gear to topped out i'm going fast enough