think of it in tems of gearing 140/170 is equivilant of 14 teeth at rear versus 17 teeth at rear - a big difference. basically means less leverage but less spinning.
@Toulouse started
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think of it in tems of gearing 140/170 is equivilant of 14 teeth at rear versus 17 teeth at rear - a big difference. basically means less leverage but less spinning.