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15,38? That’s making the gearing longer! Like higher stop speed less quicky quicky!
Seems an unusual way to go! But if you like it you like it.
15, 39 = 2.6 ratio
14, 39 = 2.78 ratio
15, 42 = 2.8 ratio
15, 38 = 2.53 ratio
I believe standard chain is 104 link 525 pitch. Bigger rear sprockets require a 106 link
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