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clicking sound around BB

Old 06-29-08, 09:52 AM
  #1  
scr660
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clicking sound around BB

Whenever I put more torque on the pedals, the bike makes a weird clicking sound with every revolution of the crank arm in the same place, every time. It doesn't disrupt the cadence, but it's really annoying, and I'm afraid something might be loose; I'm pretty sure it's not the cassette or chainrings, since the clicks are there on every gear. It sounds a lot like the chain slapping against the guards, but that definitely isn't happening; I'm 90 percent sure it's not caused by rubbing, as it only happens when I put a lot of force on the pedals, and it happens in the same position every time on every gear. Also, i looked closely when I was off the bike, and there was no rubbing.

Could it be a loose bottom bracket or a crank arm problem? I have a truvativ rouleur with integrated bb and ultegra 6600 groupset
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Old 06-29-08, 10:12 AM
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Banzai
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I see you've posted this problem in this forum as well.

Banzai is now going to solve your problem. Watch, and be amazed.

The self-extractor bolt on the left crankarm that secures the arm to the axle fixed to the right crankarm has been overtightened. There are very specific torque figures that need to be followed.

Overtightening this bolt is side-loading the bearings, a stress they weren't designed to handle. The side load is causing the clicking sound when you apply enough power to the crank.

That endcap bolt needs to be loosened, and needs to be tightened to specs. The clicking will go away, I promise.

(That, by the way, was my theory to begin with. Happens a LOT with the Shimano cranks as well. Guys are in the habit of working with more traditional bottom bracket assemblies, and on those you pretty much just want to secure the arm to the bottom bracket as tight as possible to prevent it from coming off.)
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Old 06-29-08, 06:43 PM
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Two things-

I had a click that was difficult to find, finally found a loose tension adjustment on SPD pedals. Tightened up the tension a turn or two and eliminated the problem.

I rode with a guy that was hearing a click from the bottom bracket area, but couldn't pinpoint it. A couple of weeks later, still clicking, the right crankarm fell off and pulled the RD into the spokes. Did a couple of hundred dollars worth of damage.
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