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Old 03-31-09, 11:53 AM   #1
Walkos
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Replaced Chain and Rear Cassette -- Grinding feeling

I have an Orbea Dauphine with full Ultegra set-up. I recently replaced my chain and rear cassette at a LBS and I know experience a grinding sensation while pedaling. Any thoughts?

Since this is probably a common problem, I tried searching through past posts but i could not find an answer.

I appreciate your help.
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Old 03-31-09, 12:00 PM   #2
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maybe try lubing the chain. New parts needs some time to break in and mesh.
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Old 03-31-09, 01:00 PM   #3
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Could be that the indexing is slightly out on the derailer also. Not enough to affect shifting but enough to cause some chain clatter.

-R
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Old 03-31-09, 01:24 PM   #4
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CCrew, how do I check if the indexing is slightly out?
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Old 03-31-09, 02:08 PM   #5
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sounds like a dirty gritty chain - flush and clean chain and wipe off the cassette and chainrings too. Lube with some good chain lube and WIPE OFF THE CHAIN after it soaks in a bit.
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Old 03-31-09, 02:31 PM   #6
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Quote:
Originally Posted by Walkos View Post
CCrew, how do I check if the indexing is slightly out?
pop over to techdocs.shimano.com and check on the Ultegra service info, but on all my MTB stuff it's put it on the 2nd smallest rear cog and dial the inline adjuster just until it tries to pick up the next gear and then back off about 1/2 turn. There's a Shimano process. Mine i'll slow cruise it or have it on the stand and tweak the adjuster in small increments until I get the quietest chain *and* shifting is unaffected.


As others have said though, be working with a clean, properly oiled chain before you go this route.
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Old 03-31-09, 02:50 PM   #7
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Could it be the BB? Take the chain off the chainring and turn the cranks. Feel gritty?
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Old 03-31-09, 02:51 PM   #8
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Check your bottom-bracket and your rear hub. Remove the chain and spin them by themselves. If the noise is present - it's not the chain. Put the chain back on and spin them. Noise? It IS the chain and/or indexing. Check the cables for any binding or obstruction.

jack002 - Get outta my head!
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Old 03-31-09, 03:50 PM   #9
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Put the bike in the stand and start pedalling. FInd out what's causing the noise, if you can by visual inspection. Eliminate bike ending things like cassette/chain rubbing on the frame etc.
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Old 03-31-09, 04:22 PM   #10
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In addition to what's already been said, check the routing of the chain through the rear derailleur to be sure it was installed properly where it goes over the jockey pulleys. I once put a new chain on and routed it incorrectly. It worked surprisingly well on the subsequent 40 mile ride but there was some extra noise and roughness. Was much smoother after I checked it out and ran it through the pulleys correctly.
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Old 04-01-09, 06:55 AM   #11
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Check your bottom-bracket and your rear hub. Remove the chain and spin them by themselves. If the noise is present - it's not the chain. Put the chain back on and spin them. Noise? It IS the chain and/or indexing. Check the cables for any binding or obstruction.

jack002 - Get outta my head!
Hey, it was empty and the door was wide open.
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