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What sprockets are currently on it and is this a 6 speed bike? Everything I know about the 6 speed 172 engines and their gearing tells me 55mph at 7k rpm doesn't make sense. With a 13/49 set, 6th gear at 7k would theoretically be doing around 85mph.
Maybe I am mistaken, or the gearing info I have is wrong. Doesn't look wrong, but who knows.
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