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Old 08-23-04, 09:50 AM   #1
jandamara
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Crank Sizes ?

I've been looking at replacement chainsets on some sites, and they have differing sizes (eg. 170/175mm), what is this the size of ?
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Old 08-23-04, 09:54 AM   #2
Astra
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It's the distance between the center of the bottom bracket axle and the center of the pedal axle .
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Old 08-23-04, 09:54 AM   #3
nolageek
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It's the length of the arm.
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Old 08-23-04, 09:57 AM   #4
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Your cranks should have a size stamped on them (backside sometimes) or you can just measure it with a mm tape.
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Old 08-23-04, 11:17 AM   #5
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Other dimensions to spec are the bolt circle diameter (smaller circles can accept lower gears), and the bottom bracket fitting: square taper Japanese or Euro, Shimano spline, ISIS spline.
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