A well a couple of reasons I know of . First is to keep the chain from being to long of a run , second is to have the ability of different gear ratios .
Hmm never thought of the gear ratio aspect , good answer :thumbsup: we need a ratio calculator so we can build some tire burning wheelie machines :lol:
I all ways felt it's so you can use a smaller motor with gear ratios. Change around the gear ratios and you can have a top end or a quick start. Just my 2 cents....
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