Rear Derailer Adjustment
07-30-07, 08:09 AM
#1
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Rear Derailer Adjustment
I just replaced my cassette, chain, and crankset/chainrings on my mountain bike (all xt).
My rear derailer is coming into contact with the top cog on my cassette when I'm in my small ring in the front. I have the b-screw set all the way tight, and my chain as short as I could manage to get it and still fit both big cog/ring. I have searched all over the place for an answer, so what do you think I should try?
Everything is shifting well and the derailer is a M952 (long xtr) with new pulleys.
My rear derailer is coming into contact with the top cog on my cassette when I'm in my small ring in the front. I have the b-screw set all the way tight, and my chain as short as I could manage to get it and still fit both big cog/ring. I have searched all over the place for an answer, so what do you think I should try?
Everything is shifting well and the derailer is a M952 (long xtr) with new pulleys.
07-30-07, 08:15 AM
#2
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https://sheldonbrown.com/derailer-adjustment.html#rear
OR
https://www.parktool.com/repair/readhowto.asp?id=64
Go step-by-step, and be methodical and patient.
OR
https://www.parktool.com/repair/readhowto.asp?id=64
Go step-by-step, and be methodical and patient.
07-30-07, 08:47 AM
#3
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I already looke at both of those websites.
07-30-07, 08:52 AM
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The tactical solution is a longer B screw, but that shouldn't be needed. Just for grins, check that the dérailleur hanger isn't bent.
What part of the dérailleur is contacting the big cog, btw?
What part of the dérailleur is contacting the big cog, btw?
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07-31-07, 09:18 AM
#6
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I replaced the pulleys with 11 tooth XT/LX, the same size as the XTR without the bearings inside the pulley. I also went from a standard set of rings (24, 34, 46) to a compact (22, 32, 44). Also another problem caused by having the b-limit screw all the way in causes the pulley to sit too high when it is in the mid gears, which allows the chain to more play. I checked the derailler hanger, and the pulleys are vertical of each other.
The teeth on the pulley is hitting the teeth on the cassette.
The teeth on the pulley is hitting the teeth on the cassette.
07-31-07, 12:11 PM
#7
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Chain length correct?
07-31-07, 12:56 PM
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As I stated initially I have shortened the chain as much as possible, it was worse with a longer chain.
08-02-07, 08:07 AM
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Big big.
08-02-07, 08:19 AM
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You could take this one into your LBS and see if ... oh ... wait .... no, you can't....
Never mind.
Never mind.
08-02-07, 10:27 AM
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08-02-07, 10:42 AM
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Try the Shimano method. It's on the Service Instructions.
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08-02-07, 10:47 AM
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You sound like you know what you're doing so this is probably not necessary to ask, but is the D/R moving freely on all pivot points, especially where it attaches to the hanger?
