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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 02-16-12, 11:02 PM   #1
Dean Roberts
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Unknown tapping noise...not me, the bike.

I am riding a full carbon bike, and when the bike is under load, i hear a tapping noise while i am peddaling. When i am coasting, the bike is quiet. I can't find anything loose, please help, it is such a nice bike, but this problem is doing my head in.
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Old 02-16-12, 11:07 PM   #2
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If it's once per pedal revolution it might be as simple as the FD cage being a bit too far out and touching the crank arm. Or my all time favorite, the extra bit of gear wire from the FD that you carefully bent out of the way and not the crank touches it once per revolution.
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Old 02-17-12, 08:55 AM   #3
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Had clicking on my bike and had to regrease the crank spindle where it goes through the inner races of the BB30.
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Old 02-17-12, 08:55 PM   #4
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I solved a similar issue by tightening my pedals. It was a tap or a click roughly once a crank revolution, only under power and not precisely timed. The pedals were not observably loose. It was a great tip I probably would not have reached. Hope it's useful or that you solve the noise in some other way. Chain ring bolts are another thing to consider.
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Old 02-17-12, 09:31 PM   #5
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Could be about 30 different things. Carbon creaks are hard to pin down. Could be seat rails or post, pedals, cranks, bb, skewer that needs tightening, stem, handlebar, or a tight or dry link in the chain.
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Old 02-17-12, 09:35 PM   #6
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These are the toughest to diagnose. Could be bottom bracket, pedals, chainring bolts, one pin in chain sticking out a little further than the others, cleats, even seat post and stems.

My typical philosophy is to do the cheap, easy things first. Often, I'll disassemble or loosen and retighten suspect components. It does take time, but satisfying when you solve it.
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Old 02-17-12, 10:28 PM   #7
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My carbon bike developed an irritating click, two clicks per one full revolution of cranks. It did not click when coasting. Bottom line, it was the seat post. I marked seat post level with tape and removed post. Cleaned seat post and bore of seat tube. I applied carbon fiber assembly paste to the post and installed it with my torque wrench. No more clicks.

You might try coming up out of the saddle to pedal and see if the click is still present.
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Old 02-18-12, 01:46 AM   #8
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only under load?
check bottom bracket for looseness, probably is clicking each time weight shifts between left/right crank arm
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Old 02-18-12, 04:58 PM   #9
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My carbon frame clicks at the 10 and 4 oclock positions, but only in warm weather. I've checked everything I can think of in the BB area. Have no ideas what it is. I'm just living with it.
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Old 02-18-12, 06:59 PM   #10
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I had something similar and it turned out to be a very loose spoke in the rear wheel
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