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Grinding in new Ultegra cassette...thoughts?(3 posts)

Grinding in new Ultegra cassette...thoughts?harper
Sep 18, 2001 8:37 AM
Please help me decipher the message my bike is sending:

I switched out my cassette from a 23 to a 25 and installed a new chain. Installation was a snap. Ran the rear derailer through the gears a few times and shifting was smooth.

Took it out for a ride and immediately noticed that the third lowest gear (I believe it is the 21 but not sure) had a distinctive grinding sound -- in fact, it was so pronounced that I could feel the grinding through my shoes.

One shift either way silences the noise. I double-checked my shifting and it is spot on. Also put the derailer in the offending cog, and tried to adjust the noise out, but it never stops and then shifting is off.

I'm thinking the cog is defective, but inspection doesn't reveal any irregularities and my untrained eye can see.

Any one have any ideas? Thanks.
Two thingsgrzy
Sep 18, 2001 8:49 AM
Assuming your cable setting are spot on then it's either a messed up cog or possibly something in the drive train is out of alignment. Could be a bent der. hanger. Try swaping the cassette body. If a cog is messed you may no be able to detect it with the naked eye.
Two thingsharper
Sep 18, 2001 9:11 AM
Well, I did not mention that I indeed swapped out the cassette body and the noise was absent. Prior to the new cassette, my drivetrain was totally silent unless I crosschained. I purchased the item from Performance, and I will send it back and see what happens.