Bicycle Mechanics - Crank Sizes ?
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08-23-04, 10:50 AM
I've been looking at replacement chainsets on some sites, and they have differing sizes (eg. 170/175mm), what is this the size of ?
It's the distance between the center of the bottom bracket axle and the center of the pedal axle :).
08-23-04, 10:54 AM
It's the length of the arm.
Your cranks should have a size stamped on them (backside sometimes) or you can just measure it with a mm tape.
08-23-04, 12:17 PM
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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