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New chain and cogs, but now rear derailleur is noisy
I recently changed my chain and cogs because my old chain started
jumping on the cogs. (I could see that the old cogs were pretty scalloped-out.) The new chain is a SRAM and the new cogs are Sunrace on an old-fashioned freewheel. Now the drivetrain is noisy. Either the chain, the cogs or my rear derailleur is not a happy camper with the new parts. I think the noise seems to be coming from one of the jockey wheels on my rear derailleur (a Deore LX). Does it sound to you like I need to repair the derailleur, or are my chain and cogs just not happy together? Can you buy jockey wheels for a Deore derailleur separately? Thanks. Retro |
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#2
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New chain and cogs, but now rear derailleur is noisy
wrote in message
... I recently changed my chain and cogs because my old chain started jumping on the cogs. (I could see that the old cogs were pretty scalloped-out.) The new chain is a SRAM and the new cogs are Sunrace on an old-fashioned freewheel. Now the drivetrain is noisy. Either the chain, the cogs or my rear derailleur is not a happy camper with the new parts. I think the noise seems to be coming from one of the jockey wheels on my rear derailleur (a Deore LX). Does it sound to you like I need to repair the derailleur, or are my chain and cogs just not happy together? Can you buy jockey wheels for a Deore derailleur separately? Thanks. Retro Which SRAM chain and how many cogs on teh Sunrace freewheel? I assume you did readjust the derailleur after installation of the freewheel (since the replacement may not line up in the same place as the original)? --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com |
#3
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New chain and cogs, but now rear derailleur is noisy
Some of those replacement cogs or derailluer pulleys are aluminum, and the
older stock cogs were plastic. There is a noise difference between the two. When I changed the pulleys on my bike it was more noisy. wrote in message ... I recently changed my chain and cogs because my old chain started jumping on the cogs. (I could see that the old cogs were pretty scalloped-out.) The new chain is a SRAM and the new cogs are Sunrace on an old-fashioned freewheel. Now the drivetrain is noisy. Either the chain, the cogs or my rear derailleur is not a happy camper with the new parts. I think the noise seems to be coming from one of the jockey wheels on my rear derailleur (a Deore LX). Does it sound to you like I need to repair the derailleur, or are my chain and cogs just not happy together? Can you buy jockey wheels for a Deore derailleur separately? Thanks. Retro |
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New chain and cogs, but now rear derailleur is noisy
I'm still using friction shifting. No SIS for retroguy.
Upon closer inspection, I think the problems were that: (1) my derailleur hanger got a little bent out of vertical. I inserted a 10 mm tap into its threads, and could see that it was not parallel to the right pedal shaft by a couple of degrees or so, so I was able to get it vertical by bending it slightly with a big crescent wrench. (2) Also, I probably didn't have the derailleur tension tight enough, so the top jockey wheel was too close to the cogs. |
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New chain and cogs, but now rear derailleur is noisy
Mike, aligning the derailleur hanger didn't solve the problem. Would
you mind giving me some more advice about this? It just sounds like the chain is rubbing on the top pulley of the derailleur during about half the pedal stroke, when under power. It runs fairly quietly when not under power. The chain is an SRAM PC-870; the Sunracer 8-speed freewheel is 32-14 and the rear derailleur is a Deore LX. Are you aware of any problems with running these components in combination? Thank you very much for your help. retroguybilly |
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New chain and cogs, but now rear derailleur is noisy
Mike and Andrew, thanks for your help.
Nope, it's a standard SRAM chain on an 8-speed freewheel. It just runs really lousy under load. It doesn't skip or jump over cogs, but it runs really noisy and sounds like something's rubbing or grinding slightly. And no, it's not my derailleur adjustment. I've been talking to a couple of other riders, and they claimed to have had the same problem when they tried to use a SRAM chain with a DuraAce cassette, but when they installed a Shimano chain the problem disappeared. They also claimed that this incompatibility is fairly well-known. Do you think this is true? Then again, maybe I need to adjust the horizontal alignment of the derailleur hanger. I don't want to unfairly indict the SRAM chain if such is not warranted. If I hadn't paid so much for the SRAM chain at the LBS, I'd just go out and buy a Shimano chain and try it. Thanks again. |
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