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Thread: Crank Sizes ?

  1. #1
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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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    Senior Member Astra's Avatar
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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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    FixedGearQueer nolageek's Avatar
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    It's the length of the arm.
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    LeMond Lives! Dusk's Avatar
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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.

  5. #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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