Stringbike 2014.
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- Опубліковано 20 вер 2024
- Stringdrive Technologies Llc.
Stringbike is pioneering in inventing a revolutionary way of getting bikes into motion, completely doing away with conventional chains, derailleurs, gear shift mechanisms and related parts.
The heart and soul of Stringbikes uses a uniquely innovative technology: strong, durable and extremely flexible ropes and an accompanying drive-train. Similar ropes are used in fitness training to lift weights and at heavy-duty sailing equipment.
Please visit our website: stringbike.com
Is it lighter? More durable? Mud resistant?
Basically why you think it's better than current solutions?
Same question came to my mind
Also can anyone just cut it with scissors when you're not looking?
+gietek You can carry extra (and very light) strings.
+mikelo303 Not sure if it is lighter, but doesnt look any heavier.
Doesnt look "mud resistant", but then again, mud doesnt seem to affect performance as it does with chains.
And it probabily isnt any more durable than a single chain, but it looks simple to replace.
If you break one cable, you can probably still get home with just one side, if you dont have extra cable on the spot.
I can't tell it is better, but certainly doesnt look any worse. If it is the same price, I would certainly try.
But a big use i see for this: You can make possibly any kind of design for the pedal drive, so you can make any kind of applied force graphic during the pedal, and even improve a concept like the oval or osymetric chainring.
And another advantage i see is: if it is mass produced, you can have way cheaper shifting. It seems simpler than a derraileur. And you can possibly combine it with an adapted version of Shimano Nexus, or NuVinci hubs.
I also think the pedals could be simplified if you added a sheave directly in the outer part of the crank arm, between the pedals and the crank, and also add the gears to the crank. And then, you can add a sheave in the seat tube, just where a front derailleur would be, so the force would be put in the front part of the movement.
+mikelo303 Spring Drive is far more simple and more convinient than chain drive and gear shift mechanism ;-)
Spring Drive
- consits of less parts and more simple then chain drive as there is NO shifting mechanism on the back wheel,
- offers the possibility of shifting while STANDING or while driving UPHILL
- is cleaner because it uses NO grease on the outside,
- offers smooth driving as there is NO micro vibration caused by the links,
- offers immediate starting without the need of turning the pedal into horizontal position, because it automatically repositions the pedal into horizontal position when you take off your foot
lets show you a couple of strings with no explanation of how it actually works. a system that requires completely proprietary frames for it to even work wont really catch on that well
ISiupick wrong video
ISiupick are you incapable of thinking? its really easy to see how it works
It works like your lawnmower starter
seniornuggtes nm
It's called a capstan drive.
Friction.
This is a prime example of thinking whether they could, rather then if they should.
Yup totally, Exactly like your poor thinking. Just like the rest of the world and stupid people like you. But hey when real people make something and it comes around, O MY GOSH you're riding it.
Just like the guy who made bikes, I mean. We all could walk, or ride houses. Why ride bikes? But now look at the world.
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOHHH!!!!!!!!!!!!!!!!!!!!!!!! Prime example of stupid people like you.
KillerRaptorr they took the concept of a bicycle and made it worse, how am i stupid for it?
Demonhog Plays Forgive him, no engineering backround.
This system makes it easy to insert and eject the rear tire.
@@ozzykircali2446 -- _kind of_ . . . but if that's the main advantage, it would be a lot more straightforward to invent a run-flat tire that wouldn't be vulnerable to going flat.
What a great try on the endless way of innovation! The string drive concept might show its advantages not only in this marvellous bike but in other bikes in the future as well.
Question -- is circular pedaling even ideal in the first place? This drive train could easily accommodate elliptical pedaling or linear/pump pedaling, which might be nice on a recumbent where you can take advantage of the resistance of the seat back against your back.
That's the first thing I thought is that this belongs on a recumbent
The problem with linear is only one leg is doing work at any one time
I know what I get from a traditional bike. There are no strings attached.
WOW, so much hate on a new idea, instead of just saying that "it's bad", at least say WHAT YOU think is bad so the designer have something to work with.
I think it's a really cool idea, it's very informative, you get rid of that oily chain that no one want to touch, it could be quieter than a chain (depending on how the pedal contraption sounds), it seams to be many times easier to change than with a chain (and again, no oil = clean hands after maintenance).
Ну, диванных экспертов никто не отменял!))
He make this revolution with much effort. If we don't want to buy it at least we can appreciate him. Not mocking him and cut his passion. Please don't mock him like you always right.
At least no scum bad will steal the back wheel as they won`t know what to do with it as it won`t fit anything else. ( No sprockets)
+colin bruce use it on the front
faceballbat well, that depends on the width, normally front hubs have a width of 100 mm and that thing looked considerably narrower.
I love your nic btw
they'll just cut your strings
colin bruce why couldn't he just put it on his bike?
My first thoughts at a glance is that this can't be an efficient power transfer.. I presume that in each instant when those strings see a load they will slightly elongate, resulting in energy loss.
I'd like to see the numbers on energy loss between this vs conventional setup.
Obviously no system is perfect.
Also how does it affect performance, not just within the internal power transfer, but the pedal strokes. Like how does it feel to ride it? What muscle groups are recruited and at what point of the pedal stroke... Basically can a rider achieve the same performance across both platforms.
Also how many watts can it handle before failure.
Seems pretty awesome for just cruising around. Obviously innovative and functional. But if energy loss is a serious problem, it could turn even a casual joy ride into a suffer fest.
thacrackfox i think they could fix the elongation problem by using cables
+Sky Walker I think using cables sort of diminishes what they were going for here but would definitely fix any power loss issues.
thacrackfox
not sure you but i dont see it handling 100W for many kilometers......
maybe if they had used nylon or kevlar but that string looks like a shoe lace
very true...
Moot. It's Dyneema cord.
It's technically beautiful. I would like to know the advantages of this kind of bike over the regular chain bike.
pros could be it has string on both pedals so its better pedalling experience, string replacement is easier, rear tyre can be esily removed, its now lighter as you are pulling less metal (chain and sprokets) and would be a little more efficient to ride (chains links have losses due to friction)
But all this can be easily achived by chain drive as well at half the price, except it is a bit heavier, and less effcient, keeping all other parts the same.
So its basically more effiecient, lighter bike thats almost double the cost.
@@6s9hcr2 Silent too !
@@geocoucool well, lets say the bicycle is not known to make much noise in the first place. But yes, you are correct.
@@6s9hcr2 yes I agree with you
@@6s9hcr2 losses on this will be a small amount of pulley friction - especially rolling around the "cam" profile in the pedals. Also string stretch hysteresis. If it takes more effort to stretch the string than they pull back. A steel cable is less stretchy, but isn't flexible enough to track round the pulleys properly. Mind you it's got 4 string segments per side supporting the load and the runs aren't hugely long.
*Thanks UA-cam! That is what i wanted to watch 2017!*
youtube made you watch something?
A lot of people out there saying those string are going to break must not be familiar with some of the man made materials available. 4mm cord is readily and cheaply available with over 1000 lb tensile strength. Go to some exotic materials and I'm sure your looking at several times the strength of any bicycle chain.
They were so busy figuring out how they could, they never stopped to think if they should.
I want one , it's looks super cool 😍
It is very simple. If it is superior, it will survive. So, unless I didn't ride such bicycle what can I contribute to the discussion? Yes, there are a lot of parts, but maintenance could actually easy. Again, without any first hand experience, it is difficult to form a proper opinion. Moreover, there seems to be a trend towards chainless systems. And who says that the string bike can't improve. So all in all I like the idea - not for the sake of innovation. It simply is an evidence for creativity and the will to do things differently. Remember: there is no box :-)
gregistopal it works like your lawnmower starter, the fucking string doesn't need friction, it will fucking fling that dirt while you pedal just so you know
Sky Walker Do you work for the company or something? Every one of your comments on this video have been you aggressively defending this impractical concept.
No, it is way to over complicated, and the bike frame has to be re-designed and it is just not worth it. We already have belts and chains that are tried and tru. this is useless.
+Dave _ Spring Drive is far more simple and more convinient than chain drive and gear shift mechanism ;-)
Spring Drive
- consits of less parts and more simple then chain drive as there is NO shifting mechanism on the back wheel,
- offers the possibility of shifting while STANDING or while driving UPHILL
- is cleaner because it uses NO grease on the outside,
- offers smooth driving as there is NO micro vibration caused by the links,
- offers immediate starting without the need of turning the pedal into horizontal position, because it automatically repositions the pedal into horizontal position when you take off your foot
yea no l'll stay with the tried and true
No rear derailleur because it has been moved up to the peddle sections. so there is a shifting mech.
Now lets count the parts needed for your shifting.
There is the special addition of the peddles. Then there is the gear mech on the peddles on both sides not just 1. Then there is the rear mech that the string attaches to not to mention the internal spring on both sides. so instead of 1 hub you have 2 on 1 wheel.
By my count you ave already passed a rear derailleur bike in the amount of parts simply because you have to have double of everything on both sides to make this work
moving a peddle to your comfortable starting position is not an issue. To pass that off as a benefit is senseless as my starting position is different compared to where someone else would like their peddle to start off at.
Then you have the string Strings fail more than a chain or belt. So again I will pass This is over complicating things for no real benefit. To redesign something like the drivetrain of a bicycle you have to provide a benefit. This does not do such. It is just over complicating it.
László Pálfi but it costs more, like trying to sell ice to Eskimos
It's not pinned dumbass. It's looped through. How does it being connected have anything to do with reliability?
Where? Bitch, where? Where did I bitch about slipping? If you are referring to the string getting wet. You need to go back to school little kiddy boy. Did you know that when clothe materials get wet they soak up water and the properties change? You should do some research you dunce.
if this shit is more expensive than an average roadbike prices, those who made this have problems.
really ..
and it looks more complicated ..
why would any one pay for it if it's not cheaper
THE MASTER NEZAR it works like your lawnmower starter
Finally! I've been asking for a string powered bike for years!
if its not broken why fix it?
Corl Franco to improve it. If we take it a bit further and move to motorcycles, a chain has quite a few flaws. A chain needs "constant" cleaning, and needs to be regulary lubed. And you have to constantly tighten it so that it doesnt jump off the sprocket. And also, if it should snap, its unlikley to run straight off, and would lock your back tire. A belt removes a lot of these issues, but is much less efficient (11% power loss, compared to 3% on the chain) pluss a belt is expensive, so its a lot more expensive to replace. The string could improve the bike, but i fail to see where
+Riftborn Ever heard of rubber drivelines? Quite common on bikes nowadays.
+Riftborn riiiight i just finished reading you comment. Forget what i wrote. Also, thank you for helping me find the right word for "rubber driveline", lol. Belt belt belt belt belt belt belt
Haha, nice :D
Forget chain and belt, I prefer my shaft driven bike.
Looks amazing at the end for people with unfunctional legs.
wow a bike that you have to peddle.... and its more complex and expansive then a traditional one....now that innovation.
what incredible ideas humans can have.my respect!
Super cool, but kind of off how Audio stops half way through the video...
Powodzenia, będzie się przecierać. Do tego już widzę te zerwane sznurki podczas podjazdów pod wzniesienia... Mi się kilkukrotnie zdarzyło urwać łańcuch przy podjeździe...
to jak ty jeździsz? grindujesz na najmniejszym biegu czy co?
I am happy to see your alternative thinking
Impracticality taken to levels unseen in bicycling history. Congratulations.
The spring mechanism is something like those retractable cable management loops. You pull and it retract is you don't pull. When you pedal the pulling motion pulls the spring loaded hub and generate forward motion. The hub then retracts the string once the peak motion is achieved. I can see the benefit of having equal torque on both side of the hub. But this is not a car where there are 2 wheels at the back.
The fixed non adjustable wheel pin means you must have serious design and material tolerances to get it to align correctly every time.
I am thinking how much torque can those strings take? Also the super dangerous looking crank design. Seems like a lot more can be pulled inside (pants, sticks, etc) compared to a chain ring.
While it is an amazing engineering feat and design, i don't think it is safe or durable enough compared to the traditional chain & sprockets.
This looks like a really cool concept with some less than practical designs limitations.
Ingénieux ,tout bonnement fantastique.
some music and then some silence and a video I don't quite understand, but looks interesting, are there any strings attached?
I do like this idea and the trike is really cool .
I don't see any significant advantages, but I really like the concept and I think it is a really cool and interesting product.
Interesting, so a ratchet with a return spring to turn the wheel using Paracord , using 2 to make a complete cycling action with power strokes for each downward thrust . There maybe a better application to this then a bicycle, many an active wheelchair but even in that application there are already electric wheelchairs.
Has any test with pedal power meter been done on them to compare eficiency vs a similar bike with chain drive? and why doesnt the rear wheel has normal quick release and that thing mounted on a regular flip flop fixie hub?
Érico Schmitt I'm interested in power application too. Could you stand up and really put torque down on this bike and the "gear selection" stay in place? That's the location I see slipping. And the reason there isn't a quick release is because the gears need to stay on the frame. It behaves like a Maxle on a mountain bike.
Érico Schmitt they used a a thru axle so they can just drop the wheel not the whole thing because on qr skewers you have to use dropouts because the skewers can't be removed quickly from the wheel but thru axles can be removed quickly from the wheel and also they a lot stronger and stiffer than a quick release thru axles are big in the mountainbiking world and they are appearing more on road bikes.
I love this. Why? People need to question why we design and engineer things in a certain way, look for new innovative ideas. These ideas lead to advancement, either directly or by leading to creative thinking in others. This is a whole new way of thinking, and it works. Why are people trying to crush creative thinking? Did you think the rotary engine was a complete waste? Perhaps diesel electric should have been left as steam? Why even bother with diesel cars when you have petrol? Come on guys (and gals) what is the point in belittling the designers.
I do agree that the music issue should be sorted out though.
I think this needs much refinement. The problems I see with it are that special frames are needed, the mechanism is exposed (would catch mud easily, strings could be cut) and the strings might not be able withstand the power of a strong cyclist (or motor). I don't know if you can adjust which pedal pops up (I would like the right and not the left one to pop up) and if you have MTB (or maybe BMX too) pedals they might hurt your shin when they pop up. The mechanism is pretty innovative and unique though.
Brilliant concept.
Is it lighter?
Can it be simpler ?
Whats the comparable ratios?
Is it good for mtb?
I seem to remember an engineering rule: KISS
schitlipz keep it simple stupid
schitlipz it works like your lawnmower starter for anybody wondering
Sky Walker, everyone can see how exactly it works from the frigging video, making crappy analogies does not make it any more clear.
Bear Arms read around, people are complaining that it's too complicated, needs "friction", will slip once it rains etc.. If you don't like that analogy then maybe a crank wrench will better fit your bill? In anycase, there are a lot of dumb people out there that do not understand how it works and I'm only trying to help/silence them
Sky Walker It's still stupid a chain keeps power better this has losses every time it resets and all that rubbing together by the pedals will wear on those metal things there's just so many more moving parts and if you think rust is a problem on a chain either don't be lazy and oil it properly or be lazy and buy a stainless steel chain
Too much comments to read to find out if somebody already asked: This system ONLY works in a 2 crank shaft holes frame, if so, you should find the way to make it possible on standard frame.
It's interesting engineering but I have to agree with many here, why would I want one of these "String Bikes" rather then my conventional bicycle? There does not appear to be any real advantage to this design beyond perhaps being very quiet?
The friction from the pedals on those guides would wear them out extremely fast. Especially when it gets sand and dust there.
Ball bearings. Simple. There's a ball bearing in the middle of the pedals that comes into contact with the arms, and then it spins as it pushes the arms forwards. Less friction. And the rollers are just rollers. The rear attachment holders are just there to hold the string in place, When you pedal forwards, it pulls the rear hub in the back forward, then when the string is loosen. the hubs roll/rubberband backwards and you pedal again, you pull forwards again.
There may be ball bearings, but you're still adding more rotating parts than needed. 4 extra bearings for the pedal assembly alone, then you have to worry about two ratchets (with two springs and bearings in them) and the two pulleys. Not to mention that it seems that the wheel itself needs a set of bearings and such.
It's a pretty cool concept. With all the blabbering about rules of engagement yadda yadda. I think that a true engineer would appreciate the idea and thought put into this bike. Although it may not be as durable as a conventional chain bike, it's cool to see odd things being done.
Its fancy. I get it.
In the chain system, it WYSIWYG. Whatever power you give to the pedal gets transferred to the hub.
In the string system, does it give you extra force or something due to string tension..?
Just trying to think positive about this approach..!
It's meant to ride around in an exposition setting, where there isn't environmental factors involved.
After reading many, too many, of those complaining all I want to say is WELL DONE!
This is not ever going to be a replacement of the time tested bicycle we already have and love. But this is engineering at its best. Not that the end result is the best solution. But it is someone working outside the box and that is just not taught or encouraged in most of today's academia.
However I have my engineering brain working over board on other places where this ingenious little device could truly be put to great use vastly improving its performance.
Well done my friend, well done.
With a conventional crank, a leg generates the sinusoidal torque in downstroke only. Both legs have sinus of torque of double cadence. That means tongue changes in 0-100% its value around 50% avg. Making the propulsion phase longer than a bike has would contribute to propulsion more given the same stress on joints. So, string bike developers must juxtapose torque diagrams to make their case. Traditional chain is not that awful compared to this awkward pulley demonstration for school students.
You had the opportunity to share engineering knowledge but just ended up sounding snarky. Oh well.
A snarky tone prompts a check it out, and if a post is B.S. the author is the idiot with emotional problems. So you are welcome to prove me the idiot but with your engineering knowledge only without resorting to ad hominem. If you tried-&-oked, just say, "Thank you for unpaid education. Too many "wanna-be" Edison litter the Internet with their "inventions" having no real STEM education. Officially retarded (his teacher diagnosed it) Edison was a thief of intellectual property as he hired hundreds of engineers and if history repeats itself, then only as a snark."@@tonyhawk123
so its an alternating ratchet drive on each side of the hub with an involute drive at the crank? any mud in the crank drive would make the motion feel horrible and the ratchet at the back would wear but no where near as fast as the string once it got full of grit, and how you slip of the pedal and crash every time it breaks under heavy load
Fajny wynalazek :), ale i przykład jak skomplikować prostą rzecz :)
Wait what was so wrong about the bikes we already have?
I can see a sentiment towards cyclic motion (the pedaling) which doesn't seem to be necessary (as the end of the video shows with the trike).
Looks like a great concept, but how is it about:
Efficiency (energy loss in string, internal spring etc.);
Weight (in order to compare to conventional drive&gear systems);
Longevity (ie amortization - which parts and how fast and how far they go. And how much would it cost to replace) - for example the hub's heavy duty springs, I guess they're taking the most load in form of deformation, and while designed for that I guess it does affect their life?
So, you made a system that will only work with a bike that is already built for this system. That's sounds extremely expensive for the buyer.
A system that looks more fragile than the chain system too.
It looks smart, and it has the benefit of not making your pants dirty, but it basically solves a non existing problem
More ground clearance at the bottom bracket is an advantage.
Need to figure out how to use a disc brake on the rear still.
At last someone solved the problem of keeping one's trousers clean on a bike !
When I see a bicycle, I think of the flapjack episode. "Bicycle! Bi meaning 2, cycle meaning 2!"
The drive mechanism may have a future in personal locomotion. Wheelchair and the like.
Love the comments below. I guess no one grew up using pull back toy cars, or ever made a rubberband car before. It's very easy to even understand how it all works. Sure the interesting cable pull system is a tricky part (For gear shifting.) , But for the most part that's fairly easy to overcome on any bike.
All they did was change the drive system to be a rubberband system with strings. Understanding a high strength string system like Paracord or bungie cord is like 101.
I think it's awesome. I mean this isn't around probably. but it's a nice idea that was tossed about. I mean look at half of the bikes around now adays. We got walker bikes, belt driven bikes, shaft driven, etc.
Well, how does that improve anything at all? Does it bring any advantages with it?
The whole question is, does the lever and pulls setup give more power to the wheels. I don't see how this could get a top speed of a big pedal gear and a small sprocket.
cool concept, and even adaptable for handicapped riders, where conventional setups are not
It's ME who imagined it long before this one !
I think this should be an obvious question, but why have you not added a compound pulley to the system? That would allow higher gearing with the same force = faster speed with same effort = actual improvement over standard chain drives... or am I missing something here?
Cool idea until you park it outside and someone cuts your "chain"
Gillysaurxx You know it's not that hard to remove a chain. But I can see how 10 year olds might want to bully you because you dare to be different, and cut your chain just to rile you up. They's enjoy the novelty of cutting string because there nothing better to do with their lives.
timithy4569 Nope, people do such things just for fun, especially because they don't have any other work to do
And iv the chain is not cutted they stab the tires.. come on..
I'm curious how the shiftting mechanism moves easily while purposefully shifting, yet stays in place at the angles it swings. It's difficult to believe the detents offer both the freedom and security about these motions, unless they are over a small margin.
I can see my pants getting caught in that worse then a normal chain bike... RIP pants. You will be remembered.
It's just something that looks cool but in reality is just impractical
Great invention 👏
Does it solve any problems? Or is it just a novelty. You'd thing 5 minutes would be enough time to tell us.
Looks to be a centrifugal clutch hub mechanism that would enable the rocking pull motion at a guess...
I think it's pretty cool. Innovation helps refine products. It's for the better even if it's not perfect and doesn't catch on. I'd like to ride one though. My interest is peaked.
It's all fun and games till the string market collapses.
Dope concept idea and model. Only thing I'd be worried about is someone cutting he strings or the strings getting torn.
Interesting mechanism but what's the point? I don't see any advantage. Weight of the chain is negated by all the other additional required parts. If anything it seems to be less energy efficient.
Okay that's one of the wildest ones I've seen
If you chage chain system than change rider position to more comfortable since you need to push pedals not spinning like classic bike.
Superheavy... First thing which came up my mind
Is it cool? Yes. Is is reinventing the wheel? Yes.
What is your goal with this system? And I'm not being sarcastic or asking to make fun or to bother.
I really want to know in what was you thinking when you made that system? Apart from a more efficient transmission than the chain.
What's the benefits of this compared to chain driven bikes? The only thing I can think of is reduced weight.
I wonder if it would be too complicated and expensive to make the string a jacketed cable instead.
Interesting design . But i don't think it would withstand the forces generated going uphill or on a sprint. Also, someone could cut the string. Can not be replaced with some kind of steel wire?
It looks cool but is it more efficient? Also the maintenance seem almost impossible from home... (For the string mechanism)
More moving parts = greater risk of breakage
Also, whats wrong with the regular chain/belt setup? Just because something is new and works doesn't make it a god invention.
The first step after having an idea should be thinking if it is any better than other available technologies. This step seems to have been skipped, as you don't gain anything other than a lot of big exposed moving parts.
Gr8...bute it will work while ☔ raining?
The strings are very inviting to be cut through. Leave bike unattended - push it all the way home.
Why convert rotary motion to reciprocating and back to rotary? Was this just some exercise for a university? What about dirt grit and lack of owner care and understanding? Thanks for showing it and maybe consider designing a better shaft drive bike.
so you get to choose between week springs which cant keep up at high speed, or strong springs which give insane amounts of drag.
also, their is no real way to oil the cams on the pedals which will wear out in a month or two.
also, if you want reliability, just get belt drive.
That looks super complex. And won't it flex pretty bad and sag after a while?
well it looks like the idea of beautiful, however where is rest of it. pull from the top and remember the leg.the leg is a human thing and what actually the length?
I think this can apply to wheelchair hand level control.
I don't get what advantage dows this device have but it is a creative system, that's for sure
Maybe it looks cool but what does make it better than a normal bike
Very interesting BUT WHY??????
It has some advantages, but shifting is not one of them. Forget shifting. The ratio between the higher and the lower gear is just 2x. Like a 19-gear 11-22 cassette. So it's almost a single speed bike (which the brand also produces).
There's not many ideas I think genius, to start with I was sceptical, but the idea is great. It's like all things could have the possibility to be a design fad or become the standard. I'm sure Shimano and the likes will make the market hard. It's going to end up being dubbed the yo-yo bike!!
Reinventing the wheel with less efficiency. Nothing wrong there.
You have to cover those strings with some protective case. Otherwise some has been cut or burn those strings
cut or burn? That's like saying same thing to do to your chain or belt. Anyone could break your chain off your bike easy with a chain break tool. But do people do it? no. They want the bike in whole or leave it. Common sense goes along way bud.
KillerRaptorr People stealing just someone's wheels is more common than you think. I had a friend who had both of the wheels on his bike stolen when the frame was chained up well.
Inclined or rugged terrain. Can the rope handle the tensile strength required? A big NO.
How much friction can they handle?