Oct 27, 2003 2:44 PM
|Yesterday I was on a short descent and noticed some slight squeaking coming from somewhere in the drive train. It sounded like it was coming from the cranks or BB, but you never know when you are riding. As the ride went along, the squeaking got progressively worse.
As this became progressively more annoying, I realized that the squeaking only happened when I was not pedaling and the road was not perfectly smooth. I was finally able recreate the problem by pedaling backwards about 1/8 of a turn.
When I got home, I put the bike on the trainer, but could not recreate the problem. My first thought was that it was coming from the rear derailler (sp?) pulleys, but that does not appear to be it.
I'm going to give it another go over tonight to see if I can figure something out.
Any thoughts or ideas are appreciated?
|re: Squeaking problem||innergel|
Oct 27, 2003 2:44 PM
|BTW - I have a Trek2300 with full Ultegra drivetrain.|
|now this is just a guess.......||flakey|
Oct 27, 2003 3:39 PM
|but I would look at the hub and cone seals. Get a little bottle of Tri-flow with the needle applicator and put a little on all the hub and cone seals.
Nothing else is moving besides the hub when your not pedaling.
|How could it be the derailleur?||Kerry Irons|
Oct 27, 2003 5:47 PM
|You say the only time you get the noise is when you are coasting. Only the hubs and the freehub are moving when you coast. It sounds more like something in the freehub mechanism, which is the only that moves when you coast and doesn't move when you pedal.|
Oct 28, 2003 7:02 AM
|The reason I thought it was the derailleur pulleys was because I noticed the squeaking more with small movements of the pedal, but only backwards. Even when I'm coasting on uneven roads, I'm bouncing around just a bit which was causing the pedals to move just a little bit. When I exaggerated this movement by pedaling backwards 1/8 of a turn or so, the squeaking increased.
At any rate, I checked the derailleur and that was not it. And I could not find it. I did not check the freehub, so I will do that tonight.
Thanks for the advice. I'll keep everyone posted on the results.
|also check out...||ChazWicked|
Oct 28, 2003 10:04 AM
|The derailleur body spring pivot and the derailleur cage spring pivot. Slowly push on the lower part of the cage and listen for squeak and or any indication of an issue. I certainly couldn't hurt to lube those pivots. As drivetrains aren't completely perfect, slight movements when backpedaling or bumps in the road may cause this. Why you wouldn't experience this when pedaling normally is a mystery.
If it were me, I'd lube all pivots, the jockey wheels, and clean/lube the drivetrain.
Another isolation test would be to take the chain off of the cranks and spin them slowly forward and back, listening for anything.
|yet another update||innergel|
Oct 28, 2003 8:28 PM
|I was just in the garage doing what everyone suggested. I could not recreate the noise no matter what I did. I cleaned everything to shining and relubed all around. Still no noise.
Then I looked at the front brake and it was toed in just enough to where it was touching the rim if I put any pressure on the front end. When I grabbed the brake, here comes a squeak. I took the front wheel off, cleaned and lubed the brake and wheel and put it back on. I can't get it to squeak anymore.
I will not be able to take it for a test ride until tomorrow, but I think I have found the culprit.
Thanks to everyone for their advise. Quite the interesting little project, and I have a freshly cleaned and lubed drive-train that is squeak free (hopefully).