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Drivetrain Vibration(6 posts)

Drivetrain Vibrationjustina
Apr 12, 2002 10:16 AM
This is my second attempt at appealing to those more knowledgeable than I for help. I have a Chorus 10sp drivetrain on a Ti frame. I'm pretty handy as my own wrench and have built up and meticulously maintained all my bikes personally. I get a bit of a shudder/vibration somewhere in the drivetrain, typically under more powerful pedaling. Any ideas, experience with this would be appreciated. Is it a biproduct of a flexy Ti frame, BB issue, chain rub problem, peddle bearings, I'm stumped, please help.

Something in your description says derailleur pulleys nmdzrider
Apr 12, 2002 10:55 AM
More info?Kerry
Apr 12, 2002 4:43 PM
All gears? Big ring, little ring, both? How many miles on the chain, cogs, chainrings? How much elongation in the chain? How clean and lubed is the chain, and with what lube? How close to the cogs is the upper pulley? Pedals, chain rub, BB and "flexy Ti frame" are the least likely cause. For the BB, you should be able to feel any "looseness" or roughness in your fingers - same with the pedals. Chain rub maikes noise, but doesn't shudder. A flexible frame may sway, but not shudder. Anyhow, how flexible is it? Unless it has small diameter tubes, it's probably not all that soft.
re: Drivetrain VibrationJimP
Apr 13, 2002 1:37 PM
I have had that happen when my chain and pulleys needed cleaning. The issue with the pulleys seems to be a lack of lubrication in the bearings. I prefer to use sealed bearing pulleys with removeable seals so I can give them a couple of drops of tri-flow now and then.
re: Drivetrain Vibrationmiko
Apr 15, 2002 6:11 PM
I had some weird chain "shudder" once. It turned out to be the chain just slightly rubbing on the inside of the der. hanger.(only happened in smallest rear cog). Also this was hard to detect on the repair stand...only happened under power.
Follow Up from posterjustina
Apr 16, 2002 1:51 PM
Thanks for the help everyone, hadn't even considered Deraileur pulleys. The drivetrain is virtually brand new ~300 miles. Just switched over from winter fixed gear. I have removed, cleaned, and reinstalled the BB, cleaned the chain, cassette and chain rings, and swapped out the pedals to no avail. One thing I didn't do was take the pulleys out and check the bearings. My theory behind frame flex was as follows. Since the 10sp drivetrain has so little cog/chain clearance perhaps the stays were twisting enough to cause rubbing in the cassette. I'm even considering swapping comps with my old bike (steel with shimano 9sp)to see if I get shudder in either frame/group. A worthwhile experiment or a wasted saturday? I'll check the derailleur out thoroughly before of course.