Harleys and Buells make less than 100hp. If you put a belt on a 140hp motorcycle and take it to the track, it will disintegrate upon launch. Maybe not right away, but it will fail fairly soon. I know because I have drag raced many Harleys, from 80hp to over 300hp.

Even though the bicycle belt is smaller, the design is similar, but I highly doubt this would ever be a problem on a bicycle. Most people are pretty low power, and skidding a skinny ass high pressure rear tire doesn't really take all that much force.

Az