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I was planning on putting in 20 39 gears in my F7 for 660' foot drags. The ratio is 1.76(10 tooth drivers), but I was wondering what would the difference be if I just put in 21 41 gear? It has the same ratio, so would it have the same pull as the 20 39 or would the extra teeth slow me down.

I would also like to know if I tighten up the chain(in the chain case) and there is a curve in the chain would it slow me down, or should I buy a smaller chain to make it fit better?
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