Had a customer with a 500cc street bike who wanted to put a 2 tooth smaller rear sprocket to increase his top speed by approx 10km per hour. I explained to him that it may do nothing as with everything else being equal top speed is simply a function of how much horsepower your engine produces. As that isn't changing, chances are that gearing is not going to help assuming his top speed now is at approx where his bike is producing max hp.
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