Bicycle Mechanics - Annoying Drivetrain Noise!
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I have a 2010 Kestrel Talon with Ultegra 6700, and I have this really annoying staccato of clicking? cracking? coming maybe from the bottom bracket, then again my carbon frame reproduces sound better than my desktop speakers...
Anyways, after leaving the bike alone for a couple hours and riding it, for the first 2 minutes the clicking will only happen maybe once every 10 seconds, but a couple hours later... well it was embarrassing passing other cyclists, since it would click consistently when I'm out of saddle.
It doesn't seem to be clicking in a certain part of a pedal stroke.
It doesn't happen much in saddle, unless I'm really hammering it.
Lubricating it doesn't seem to help much, as the sound just returns within a couple minutes of ride time.
And yes I did tighten my ring O's on my bottle cage and rims! ( on Mavic Ksyrium Equipes by the way.)
Thank you for hearing me out!
01-23-11, 10:01 AM
My assumption is its either in the bottom bracket or the seatpost, both which are fairly common culprits of creaks and clicks. Bottom Brackets generally need to be taken out and relubricated, then simply reinstalled and somehow it magically solves the problem :-).
For the seatpost, take it out and regrease it up nice and good, and also take the seatpost clamp off of the frame and grease that as well. I believe that bike is a carbon frame? If so only use carbon specific grease. If there is a shim in the frame to reduce the size of the seatpost, this probably the reason for the creak. If theres a shim, ditch your current seatpost for one that actually fits the frame.
There could also be a chance that its in the bearings of the pedal, but I doubt it. Diagnose the other areas first.
01-23-11, 10:40 AM
Check the spoke tension in your front wheel maybe? I had a problem with a clicking noise a few weeks ago whenever I was in the saddle, but NOT when I was out of it, and I could eliminate it when putting weight on the front. Turns out the spoke tension on the non-driveside of my rear wheel was too loose!
If your spokes are too loose and cross each other, then they'll rub slightly to produce a clicking noise. I tightened the spokes on my wheel (then had to true it), and the noise disappeared!
Low rear wheel spoke tension or rear skewer not being tight enough tends to cause clicks and creaks on carbon frames that sound like bottom bracket noise. Seat posts sometimes will do this too but more often it's wheel related. Usually the noise comes along during/after climbs or hot sprints.
The frame picks up and amplifies the noise at the largest & thinnest place in the frame closest to the noisemaker. Guess where that is. Yup, that's the downtube near the BB.
BB's will make noise at one specific place in the rotation. If it's random, it's not the BB. If it comes and goes or fades in/out it's not the BB. You can feel pedal problems. Ditto with wheel bearings, they "thunk" or "skip" when they shift around and make you think the frame is cracked by the feeling that something "moved" where it oughn't.
In a way the frame is like a harp frame. That thinwalled downtube is the sound chamber that picks up and amplifies every thing that happens in the rest of the frame.
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