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Old 04-25-11, 09:31 PM   #1
Chris Chicago
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ARe some derailleurs just loud?

I have an old 80s trek road bike I recently acquired. It's finally getting warm enough to ride it and on one of my first trips it struck me that the noise coming from the rd was louder than I'm used to. I looked it over closely, the chain isnt hitting the cage and seems to be engaging the pulleys correctly, however there is a loud whirring emitted by the chain and lower pulley and no matter how I adjust the gears it doesn't go away. I found a video posted by a fella with the same problem

http://www.youtube.com/watch?v=e0M993kY6g0

I also found a couple threads by him searching for a fix, he didnt get one and ended up just replacing the rd and chain. My chain is new so I thought I should ask here before switching out the rd. Any advice?

Thanks!
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Old 04-25-11, 09:35 PM   #2
FastJake
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Try taking the derailer pulleys out and greasing the bushings. If they're dry they'll squeak like that. Also, make sure each pulley spins freely. What rear derailer, specifically?

Edit: oops, I just watched the video.. Well, you should grease the pulleys either way. I have a derailer that is noisy like that. New chain, new cassette, clean derailer. I can't figure it out. One thing to check is that the chain is running smoothly from the cassette to the upper pulley. If something isn't aligned the chain will not feed smoothly. Check by backpedaling very slowly and watching each link of chain go from pulley to cassette.

Last edited by FastJake; 04-25-11 at 09:38 PM.
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Old 04-25-11, 09:48 PM   #3
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Sometimes screwing in the B-tension screw a little bit can get rid of that sound.

I don't think I'd worry too much unless the shifting is crappy.
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Old 04-25-11, 10:06 PM   #4
Chris Chicago
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it is a suntour accushift alpha 4050. like this one but mine makes noise in most gears while his only a few

http://www.youtube.com/watch?v=n8r9_IV73CY

his cyclone 7000 vid is nice and quiet.


might this model not have a b tensioner? i am not seeing it right away

http://velobase.com/ViewComponent.as...8-3c604d8d6114
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Old 04-29-11, 01:30 AM   #5
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Hm, these things can be mysterious:

I have just replaced the entire drive train on my Campy chorus 8 speed - everything runs as smooth as can be.

Then (after maybe just a 100 miles) I decide to try the also new 23-13 Campy record cassette.

Result: double the noise from the rear, no adjustment makes it go away.

Swap the cassette with the 26-13 (also new record) - silent again. Go figure.
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Old 04-29-11, 02:10 AM   #6
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Metal pulleys are louder than plastic ones , But they are not subject to breaking..

Broke a sealed bearing sun tour, so I got a Tacx to get me home,
and then a Carmichael, to replace it, they made a Titanium, one = a Lifetime of wear..
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