Thread: If a 650c tribike uses 53/39, why does.....
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Old 03-27-11 | 06:02 PM
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tugrul
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From: Portsmouth, NH
What does said tribike use in the back? Only goes down to 13 on the Paramount.

53 / 12 = 4.42
56 / 13 = 4.31
53 / 13 = 4.08

FWIW

53 * (622 / 571) = 57.73
39 * (622 / 571) = 42.48
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