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39t sprocket
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12-29-2012, 09:18 AM
ckau
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Join Date: Dec 2009
Location: central North Carolina
Posts: 915
520 chain/sprockets have closer spaced links 530 stuff won't seat properly in a 520 or vise versa. The 17 tooth will give more top speed, probably not 5 mph, more likely 3 but it does speed it up.
ckau
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