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2 Questions about Sprocket Ratios and Tire Size

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Question #1:  Is there any advantage or disadvantage to using a larger sprocket set even though you keep the same ratio?  For instance, a 12F/48R vs. a 13F/52R?  I think the larger set might last longer (wear slower), but will the engine feel any difference?

Question #2:  Does putting a larger diameter tire on rear give the same (or opposite) effect as using a larger rear sprocket?  I actually know the answer to this one, but curious what others think.  I recently changed from a worn trials tire to a new knobby (both 18" rim) and was surprised to find the gearing seemed different.

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