Oli wrote: Sram.

Shimano.

Campagnolo.

All way cooler than any damn belt drive. A belt is only good for holding up trousers.

Or tanning hide.

ever thought about the fact that when a belt snaps, you have to buy a whole new frame, due to the fact theres no rejoining mechanism? Sorry if this has been said already, i ant be bothered reading through 6 pages.

rory161192 wrote: when a belt snaps, you have to buy a whole new frame

What's stopping you from just replacing the belt?

rory161192 wrote: ever thought about the fact that when a belt snaps, you have to buy a whole new frame, due to the fact theres no rejoining mechanism? Sorry if this has been said already, i ant be bothered reading through 6 pages.

I would imagine there is a way to unbolt the stays somehow, make enough gap to get it out?

its a belt, unless they invent a rejoining mechanism (which they havent yet- to my knowledge). It passes through the chainstay, so you would have to fit a complete new belt inside the frames rear triangle.

Stapler?

rory161192 wrote: its a belt, unless they invent a rejoining mechanism (which they havent yet- to my knowledge). It passes through the chainstay, so you would have to fit a complete new belt inside the frames rear triangle.

Look again. Dropout unbolts to reveal a slot.

Astoria Paranoia wrote: Stapler?

Brown sticky tape should hold it

Removable rear dropout.

JohnnyC wrote:

Astoria Paranoia wrote: Stapler?

Brown sticky tape should hold it

Nah bro hot glue

Conners wrote:

big_daddy_jj wrote:

philstar wrote:
the other reason drag cars use big tires is that they have so much torque that you need to spread the shear force of the rubber over a grater area.

Wouldnt that work to the opposite effect? surely running your tyres on a grater would be the last thing you want to do

Their fat tyres have a couple of other purposes as well:
i) They flex massively as the torque is applied (initially). If you've ever seen a photo or slow-mo video of a drag car at launch, you'll know what I mean. The tyres grip, the hub spins, the tyre effectively "twists". An anti slip/traction control device of sorts.

ii) As the tyre accelerates, it increases in diameter - thus increasing the cars overall gearing. Lower gearing on launch, ramping up as the car accelerates - it's a win win.

http://www.youtube.com/watch?v=wWce_2QM2Ro Good video of drag racing launches at 1000 frames per second. Well worth the watch.

The belts won't exhibit any noticeable stretch as you are using them, but over time the belts will stretch and need to be re-tensioned. Hence the use of a cam belt tensioner in you're car.

We need definition of friction
http://en.wikipedia.org/wiki/Friction

Belts have no friction but energy can be lost in other ways i.e. the compression and stretching of the rubber. But some of this elastic energy can be recovered...

Nice idea for commuter bikes where the low maintenance makes it attractive over chains, but I can't see it being used with a derailleur and cassette. So I don't think there is going to be a wider take up of it.

mtb_sloth wrote:Nice idea for commuter bikes where the low maintenance makes it attractive over chains, but I can't see it being used with a derailleur and cassette.

Yeah they need to stick on on an internal geared hub.

tripler wrote:if you think that the belts on a standard 4 cylinder motor are only 15mm in width? and the torque created from a car motor is way higher than a bike could produce yet there is flexability in the belt,friction?

The cam belt only drives the cams not the car this is less torque then what you produce on a bike.
It you look at a motor bike or super charger belt then you are talking about more torque.

Oli wrote: Tullio Campagnolo did NOT invent the derailleur, but he did take out the first patent on one.

They were invented in the late 1800s, but it was "Velocio" or Paul de Vivie who is widely credited with popularising them with his two-speed derailleur released in 1905.

My apo logies,most people that patent or redisign things tend to get fame for the origenal thing.

[quote="tripler"] Belts flex but dont really stretch.
Honestly dont want to get into this so lets make this as simple as possible. Find someone who has a Bridgestone folding bike from 20yrs ago and ask them how there belt has been holding out, I did. Think of how many chainrings, cogs and chains that a single speed bike would have gone thru between now and then?
Lets just say the belt starts looking a hell of alot more economical to say the least.
I might add that most of the big dogs in the bike industry dont have a creative bone in there bodies and thats why they are revisting this old arse technology, hoping that some us forgot or never knew it has already been done!