‘N Evening, there may be some text on the web, but one may try to summarize it in an article. Sometimes provided that roller weights, counter-pressure spring or clutch spring strength remain the same, how do different belt lengths affect the driving performance of the scooter? For example, the Kisbee has an original belt of 723 x 17,5 x 28; at this length the clutch has to do, at slow speeds to grab, g’rad as if softer Kupplu With a length of up to 729 the scooter drives without restrictions and has it easier when starting from the stand; the thickness of the clutch springs seems just right here. Suppose one would mount a belt, which is e.g. 6mm shorter, so has a length of 717; how would the behavior change here? ciao Wauhoo