this occured to me the other night for some reason. has anyone ever used a belt drive on a bicycle? it might be difficult with gears, but would work for single speed bikes.
harley davidson uses a belt drive on there bikes, they claim the belts have a longer life then chains and don't stretch.
maybe there would be some slippage even on a belt with teeth that would make the system less efficient?
anyone ever seen or thought about doing this? it would probably wiegh less than a chain and avoid sprocket wear. i bet if people put some thought into it they could probably even make it work with gears.