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Drivetrain(3 posts)

Aug 18, 2003 2:49 PM
Question for the wrenches out there:

I've never really tried to do any of my own maintenance until now and was wondering if I could get some help with something.

I'm hearing a clicking coming from the rear of my drivetrain, specifically, it seems to be happening as the chain comes out of the rear dr. cage and is coming onto the cogset. A slow turn of the crank reveals that it only happens at a specific point in the rotation. At the point where it clicks, it is looking like the chain makes a little jump to proper sit on the cog. With the bike turned upside down and turning the crank a little faster, the rear dr. shifts cleanly, but has a tendancy to jump down to a smaller cog.

My question is, is this a situation where it is probably just a minor adjustment with the barrel adjuster or is it something else? Any help or advice as to where to start with this would be much appreciated.
re: DrivetrainThe Walrus
Aug 18, 2003 4:57 PM
The fact that the chain wants to jump to a smaller cog sounds like there's not enough tension on the shifter cable; try turning the barrel adjuster counterclockwise 1/4 - 1/2 turn and see if that corrects the problem.

If not, is this "specific point" relative to a particular cog or the chain? I'm guessing it's the chain, which I'm also guessing has a stiff link that's preventing it from properly wrapping around the cog at that point. Slowly spin the crank backwards, watching the chain as it travels over the pulleys; if the cage "twitches", look for the stiff link (it should be pretty obvious) as it comes out of the derailleur. Put a drop of oil on the bad link, grasp the chain with your thumbs to either side of the link and flex the chain sideways a couple dozen times. That should loosen up the link. Repeat the flexing if there's still stiffness.

If the occurrence relates to a cog, look for a bent tooth; also, check the cassette lockring to be sure it's snug.
Aug 19, 2003 10:09 AM
Thanks Walrus, all it took was that 1/2 turn of the barrel adjuster and everything is back to smoothness.