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@illy
Interesting stuff. So if they're of similar efficiency to chains, the off-putting factors are cost, inflexibility in gear ratios, and the fact you have to have a special frame.
I would have thought you could come up with a joining mechanism and 'magic links' of various sizes for these belt drives to resolve the gear ratio problem.
I'm also surprised that they're so expensive, since similar belts have been in every car engine for the last 50 years!