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Thread: Crank shape?

  1. #1
    Senior Member
    Join Date
    Dec 2011
    NE Ohio
    My Bikes
    1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
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    Crank shape?

    I ride a 80's Schwinn Super Le Tour and the cranks are straight. I notice that newer cranks have a curve in them. Is there a reason for this? Does it provide for more clearance for the ankle bone?

  2. #2
    Senior Member
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    Apr 2009
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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    It might, but that's not the reason. Over the years crank sets and BB's have moved to progressively shorter spindles to improve stiffness. That moved the hub (spindle end) of the crank inboard. But the pedals had to stay roughly the same width apart to clear chainrings and chainstays, so you have today's curved arms.
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