the thing that bothers me about belt drive isn't the belt - it's the rear triangle having to come apart to install or remove it.

i worry about the potential loss in rigidity; not as big a deal with a motorcycle, as the power output of an internal combustion engine is great enough that losses due to flex will be far less noticeable.

but for a human being? there i'm not so sure. the much lower level of power output makes the same absolute amount of power loss a far larger percentage.