• Trying to fit a Stages Rival crank arm onto a SRAM S300 Courier crank.

    The original courier LH arm tightens by hand.
    The Rival still has play when hand tightened.

    I need to buy a 1/2 inch socket set for my torque wrench tomorrow.
    I don't want to go ape with it now but it strikes me as odd.

    Could I be missing something? I've only ever handled the S300 but maybe this is normal for other SRAM chainsets and when I get a big torque wrench on it, it'll be fine(?).

  • maybe this is normal for other SRAM chainsets

    It is. The spline should be an interference fit, so it should take a reasonable amount of torque to drive it home. The instructions say 48-54Nm, and also suggest that even 54Nm may not get it all the way home (where it traps the NDS bearing and eliminates end float) at the first attempt.

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