Oval chain rings and chain wrap

stueys
stueys Posts: 1,332
edited April 2017 in Workshop
Does anyone think you need to factor in running oval chain rings when calculating chain wrap and derauiler capacity? Part of me thinks yes as the oval adds two teeth at it's widest point, part of me thinks ignore as it's dynamic (literally 1/4 of a pedal stroke) and it averages to the same wrap as a round ring.

Thoughts?

Comments

  • The Rookie
    The Rookie Posts: 27,812
    No.
    The wrap is always pretty close to 180 degrees and therefore the same amount of teeth all the time (it never adds two more) there is a slight difference in chain length due to the angle change but its so small you can run an oval ring on a single speed bike.

    Your overthinking it (especially with respect to that two teeth which I can't even figure how you think that happens!).
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.

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