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Derailleur Question

Old 03-15-09, 06:08 PM
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bikehero
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Derailleur Question

Hey guys this is my first post so sorry for the newb question and lack of details. I picked up a Nishiki road bike off Craigslist and so far I'm loving it. I have even performed some basic maintainance on it [lube, retaping handlebars, ect.] but a few problems still remain unfixed.

The primary one I think has to do with the derailleur. It's super noisy, and I'm pretty sure it's coming from the pulley region. The one that came with the bike is a Shimano Light Action, not sure of any other details. I have tried taking it apart and cleaning it, adjusting it properly, yelling at it, and putting lube on it, but there's still a lot of chain noise. I was thinking of getting a new derailleur to see if that fixes it, the bike is a 12 speed, six in the back, two in front, and I think it's indexed [does that mean the gears click?]. Not sure what else to do, the noise is driving me crazy. Any ideas?

Also, any decent derailleurs for a road bike for under $50? What kind would I need?

Thanks so much and let me know if there are crucial details I'm missing and I will figure them out!
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Old 03-15-09, 06:32 PM
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Obvious question -- did you relube the chain recently?

The other thing could be something like B-screw adjustment (derailleur too close to the cassette) assuming that the RD tension is appropriate - I really like the parktool website for the lowdown on RD adjustment: http://www.parktool.com/repair/readhowto.asp?id=64
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Old 03-15-09, 06:58 PM
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The derailleur or the hanger could be bent so that no amount of adjusting will fix it. Put it into a middle gear and you can eyeball it from behind. Better yet, take it to a decent shop and they will have a tool to check the hanger. Also, Are you sure you're adjusting it properly ?
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Old 03-15-09, 07:15 PM
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moving this to mechanics
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Old 03-15-09, 08:33 PM
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Originally Posted by Homebrew01 View Post
Put it into a middle gear and you can eyeball it from behind.
Keep in mind you won't be able to see some hanger misalignemnts by eye. But it'll still be able to cause shifting problems.
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Old 03-15-09, 09:51 PM
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I did re-lube the chain, tried the b-screw adjustment both ways and it seemed to make no difference in the sound. I will take it into the bike shop tomorrow to see if it's bent, that may be the problem. I will keep you posted.
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Old 03-16-09, 04:36 AM
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Originally Posted by bikehero View Post
I did re-lube the chain, tried the b-screw adjustment both ways and it seemed to make no difference in the sound. I will take it into the bike shop tomorrow to see if it's bent, that may be the problem. I will keep you posted.
Don't blindly turn screws. If you know enough to know that the b-screw is called as such, you can look up what it does and how to properly use it -

For $50, you can get 105 level rear derailleurs or better (depending on where you shop), if indeed it is broken.
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