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Old 05-27-03, 06:44 AM   #1
mjw16
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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?
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Old 05-27-03, 08:29 AM   #2
mrfix
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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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Old 05-28-03, 08:34 AM   #3
Hunter
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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.
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Old 05-29-03, 02:30 PM   #4
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If they are tapered like Shimano, they do not go all the way down.
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Old 05-29-03, 08:26 PM   #5
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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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