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Old 09-23-06, 03:59 PM   #1
rebaths
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Grinding noise coming from cassette area.

Howdy.

I recently replaced the chain, chainrings and cassette on my bike due to high mileage. The rear derailleur is a 105.
I went from a 12-25 cassette to an 11-23 since I don't have any HUGE hills around here. I made sure the new chain had the same number of links as the old chain.

Anyhow, it all went nicely and I noticed a big improvement in smoothness and noise. However, it's been about 500 miles since then, and the rear end of the bike has developed a very annoying noise. It is sort of a grinding noise. Almost like when the derailleur is out of alignment and the chain is rubbing. It is constant when I pedal. No noise when I coast. I spent plenty of time adjusting the derailleur and even replaced both pulleys and the noise did not go away. I have checked chain routing and it's correct. I have spent HOURS watching the chain, gears, etc. and have not noticed anything obviously rubbing causing the noise.

I thought perhaps it was the bearings or something so I took off the rear wheel and put on another wheel that I have and the noise continues. I did notice that the cassette lock ring was sort of cracked or 'chewed up' when I removed it. I thought that was odd... I torqued it down to 40 N*m as specified.

Other details.. new Ultegra chain and cassette with a 105 derailleur...

Could the lock ring be causing this? If so, where can I get a new one? I saw one on Nashbar but it said only for 12t small cog, and my new cassette is 11t small cog..

Thanks.
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Old 09-23-06, 04:08 PM   #2
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Check that the derailleur arm is not bent.

Make sure you put the pulleys on the right way. There is a top one and a bottom one

Check the freehub. Take off the cassette and spin the freehub. If the bike is high mileage then this might be rough. But then again you do say that it is quite when you freewheel so may not be this. But check it anyway.

Hope this is of some help
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Old 09-26-06, 08:14 AM   #3
rebaths
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I am positive the pulleys are on the right way.. and anyways, the noise developed with the original pulleys and continued with the new pulleys. I doubt it's the freehub since as I mentioned, I took off the wheel and used another wheel with about 20 miles on it.

The derailleur arm might be bent, but if it is it's only a tiny degree since I've stared at this thing for a LONG time and it looks straight to me. And the noise has gotten worse since it started. It's not that it just happened and that's it, it has gotten louder.

When I say the lockring is chewed, I am talking about that washer thingy on the threads of the lockring.
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Old 09-27-06, 04:07 PM   #4
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Quote:
Originally Posted by rebaths
I am positive the pulleys are on the right way.. and anyways, the noise developed with the original pulleys and continued with the new pulleys. I doubt it's the freehub since as I mentioned, I took off the wheel and used another wheel with about 20 miles on it.

The derailleur arm might be bent, but if it is it's only a tiny degree since I've stared at this thing for a LONG time and it looks straight to me. And the noise has gotten worse since it started. It's not that it just happened and that's it, it has gotten louder.

When I say the lockring is chewed, I am talking about that washer thingy on the threads of the lockring.
Check that the cassette is tight, that the washer thingy is not loose and then allowing your cogs on the cassette to move slightly when pedalling. Have you correctly spaced the rings on the blcok ?
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