Most t'internet ramblings say that a 1 tooth difference is best.
Best for what? Last time I rode out to a hill climb, I found a 5 tooth difference (16/21) was best :-)
5 tooth on a double fixed or did you change at the hill climb?
Turned the wheel around at the bottom, turned it back at the top.
@bluebikerider started
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Best for what? Last time I rode out to a hill climb, I found a 5 tooth difference (16/21) was best :-)