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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 02-21-06, 12:46 PM   #1
sirthx
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I'm not the most experienced repair-guy on the block. Far from it. I can change a tire with the best of 'em, but that's about as far as it goes.

I recently developed a creak which appears to be coming from my drivetrain somewhere. Short of taking apart my bottom bracket (never done it. Would be afraid to) I think I've tried everything to get rid of it. It's like a 'click-click-click' on each pedal rotation only when under a bit of load. I've made sure left side crank is torqued down, pedals appear nice and tight, I've cleaned the drive-train pretty thoroughly. Doesn't change anything. Nothing's touching anything that I can see. Perhaps the crank on the drive side?? Any ideas?? I know it's probably impossible without actually hearing/riding for yourself, but I thought I'd throw it out there.

It's a Shimano Ultega ten in a carbon frame. Roughly 600 miles total on the set-up.
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Old 02-21-06, 01:44 PM   #2
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First thing is to torque BOTH cranks. That is usually what causes a creak.

Then check the pedals. Put a wrench on them. They can look and feel tight, and still creak. Check your cleats if using clipless.

Check all of the chainring bolts. One loose one can cause noise, especially under load.

Now the silly stuff. This happens a lot and can be hard to find.
Check your front der cable end. If it is sticking out to the side, it can be hitting your shoe. It can sound like a loose crank.

You could have a shoelace or shoe strap that is hitting the chainstay, seatstay or your cranks.

Your saddle can creak in rythm with pedaling. Some dirt on the rails or in the clamp can cause this.

On my MTB I had a creak when I pedaled that ended up being my front shocks. It almost drove me nuts. There was no way that it sounded like the shocks. Remember that bikes are made up of metal tubes, and that can really cause sound to travel around.
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Old 02-21-06, 02:27 PM   #3
Wil Davis
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Try lubricating the chain…

- Wil
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Old 02-21-06, 02:29 PM   #4
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Quote:
Originally Posted by Avalanche325

Now the silly stuff. This happens a lot and can be hard to find.
Check your front der cable end. If it is sticking out to the side, it can be hitting your shoe. It can sound like a loose crank.

You could have a shoelace or shoe strap that is hitting the chainstay, seatstay or your cranks.

Your saddle can creak in rythm with pedaling. Some dirt on the rails or in the clamp can cause this.

On my MTB I had a creak when I pedaled that ended up being my front shocks. It almost drove me nuts. There was no way that it sounded like the shocks. Remember that bikes are made up of metal tubes, and that can really cause sound to travel around.
My last noise was in my headset? stem clamp?........bars? ...no the bars cannot creak or snap.
Tick...tick.....tic.. What the hell is that NOISE!

-zipper tab on my rainjacket wasn't done all the way up.
Every time I'd jump a kerb or pull up, the tab would rock and hit the zipper.

Last edited by jeff williams; 02-21-06 at 03:18 PM.
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Old 02-21-06, 03:12 PM   #5
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Just a thought: once we had a bike in the shop with a similar problem as you describe. The frame was aluminum, not carbon as you have, but read on. We checked everything, tried everything, but still could not get rid of the noise. Finally we tried taking off components one-by-one and finally found the problem. It turned out to be that one of the bottle cage bult fasteners on the seat tube had loosened enough so that normal pedaling created no noise, but hard pedaling caused enough frame flex so that the fastener squeaked on the frame when the bottle cage was mounted. Suma sumarium: don´t overlook anything. Good luck in your case.
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Old 02-21-06, 04:52 PM   #6
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Quote:
Originally Posted by Wil Davis
Try lubricating the chain…

- Wil
Clean and T9 night before every ride. That's not it, but thanks!
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Old 02-21-06, 04:54 PM   #7
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Quote:
Originally Posted by Avalanche325
First thing is to torque BOTH cranks. That is usually what causes a creak.

Then check the pedals. Put a wrench on them. They can look and feel tight, and still creak. Check your cleats if using clipless.

Check all of the chainring bolts. One loose one can cause noise, especially under load.

Now the silly stuff. This happens a lot and can be hard to find.
Check your front der cable end. If it is sticking out to the side, it can be hitting your shoe. It can sound like a loose crank.

You could have a shoelace or shoe strap that is hitting the chainstay, seatstay or your cranks.

Your saddle can creak in rythm with pedaling. Some dirt on the rails or in the clamp can cause this.

On my MTB I had a creak when I pedaled that ended up being my front shocks. It almost drove me nuts. There was no way that it sounded like the shocks. Remember that bikes are made up of metal tubes, and that can really cause sound to travel around.
Thanks for the reply. Not any of the 'silly stuff' Happens out of saddle, no laces on my SIDIs, no cable ends. I did check the cable ends though based on a tip from a buddy.
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Old 02-22-06, 09:42 AM   #8
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I get a creak in my bar/stem vicinity that sounds like a drivetrain creak to the untrained ear. All I have to do is loosen and retighten the bars and stem and all's usually well.

Frames take a sound and make it appear to come from the BB regardless of its actual origin.
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Old 02-22-06, 11:47 AM   #9
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Quote:
Originally Posted by sirthx
Thanks for the reply. Not any of the 'silly stuff' Happens out of saddle, no laces on my SIDIs, no cable ends. I did check the cable ends though based on a tip from a buddy.
Had that same problem wit a Ti frame. Oversized seat tube had a shim to use a 27.2 post. Took awhile to debug, ended up pulling out the shim and going with a Thompson 30 something post.
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Old 02-22-06, 12:00 PM   #10
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have ur bb cleaned. it could be dirt.
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