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  1. #1
    Senior Member
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    Splined crank/bb installation

    I'm installing some RaceFace Prodigy splined cranks on my new ride and can't seem to get the crank arm to seat completely on the bottom bracket. I know it's critical that the crank arm mate flush with the stopper flange on the bottom bracket, but no matter how hard I tighten the bolt, there is still a 3-5 mm gap on both sides. I greased the splines and checked for burrs or anything else that could cause an improper fit and everything looks fine. I noticed that when I removed and re-installed the crank arm bolt, the crank arms seated a little closer. I've torqued the bolt pretty tight and don't want to over-tighten it in the process. Any ideas on how to get the proper fit?

  2. #2
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    You should use a torque wrench and torque the bolt to 350 - 390 lb in., that should do it.
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  3. #3
    NOT a weight weenie Hunter's Avatar
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    Crank arms will only seat down so far as most bb spindles are tapered as to allow the amrs a point to stop on. This allows for clearnace on the frames chainstays.

  4. #4
    Senior Member Avalanche325's Avatar
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    If they are tapered like Shimano, they do not go all the way down.

  5. #5
    The Red Lantern Rev.Chuck's Avatar
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    When you were tightening them up did you get to a point where it felt like they just stopped, bottomed out. Then they are all the way on. The splined crank/BBs don't keep tightening up like the square spindles.
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