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Rear Derailleur Compatibility

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Rear Derailleur Compatibility

Old 04-12-21, 10:24 AM
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MeagreAger
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Rear Derailleur Compatibility

I've neglected to properly care for my Shimano 600 SIS rear derailleur and in attempting to clean it thoroughly of rust, have somehow damaged it so that the jockey wheel is constantly rubbing against the bottom of the cassette. There are other identical Shimano rear derailleur's for sale, but many look worn, or are too expensive for what I am hoping to spend. The front derailleur is also a Shimano 600. Could I use another Shimano model, 6-speed rear derailleur with the appropriate cage-length and mounting for my integrated bolting? Thanks for your responses,
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Old 04-12-21, 10:42 AM
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cxwrench
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Any 6, 7, 8, or 9 speed derailleur will work, excepting a few Dura Ace models.
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Old 04-12-21, 10:51 AM
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If you are looking for older RD and use index shifting, a RD with a cable adjuster built in or a unit marked SIS is your best choice. Units prior to these may not index properly.
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Old 04-12-21, 12:38 PM
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When reinstalling the derailleur, did you correctly engage the "B" screw with the tab on the derailleur mount?
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Old 04-13-21, 03:30 PM
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It sounds like the jockey wheel bushing/bearings are kaput. I don’t know about the road bike derailleurs but many mtb models had replaceable jockey wheels.
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Old 04-13-21, 08:05 PM
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Originally Posted by dr1445 View Post
It sounds like the jockey wheel bushing/bearings are kaput. I donít know about the road bike derailleurs but many mtb models had replaceable jockey wheels.
I'm wondering how you came to this conclusion.
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Old 04-13-21, 08:17 PM
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Originally Posted by cxwrench View Post
I'm wondering how you came to this conclusion.
op said "the jockey wheel is constantly rubbing against the bottom of the cassette". also the chain should be between the cassette cog and the jockey wheel.

Last edited by dr1445; 04-13-21 at 08:25 PM.
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Old 04-13-21, 08:34 PM
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Originally Posted by dr1445 View Post
It sounds like the jockey wheel bushing/bearings are kaput. I donít know about the road bike derailleurs but many mtb models had replaceable jockey wheels.
Yes he did, and you replied w/ this. Which is wrong. Worn out pulley bearings would not make the pulleys suddenly become closer to the cassette cogs.
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Old 04-14-21, 03:56 AM
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Originally Posted by cxwrench View Post
Yes he did, and you replied w/ this.
Ah, so you can use 'w/' and we cannot use 'brifters'.... Proper words, proper words

It would be interesting to know how the derailleur was cleaned, because without (w/out) pictures it might indicate what kind of problem it is, and whether it is fixable.
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Old 04-14-21, 05:50 AM
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I'm not right off seeing this problem being caused by damaging it during cleaning. I would first think this is simply an adjustment or installation issue . If so you could possibly experience the same adjustment or installation issue with a replacement derailleur. I would double check everything before condemning the unit.
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Old 04-14-21, 06:59 AM
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Originally Posted by Chuck M View Post
I'm not right off seeing this problem being caused by damaging it during cleaning. I would first think this is simply an adjustment or installation issue . If so you could possibly experience the same adjustment or installation issue with a replacement derailleur. I would double check everything before condemning the unit.
Agreed. Likely an issue with the B screw as mentioned, could also be the way the chain was routed after reinstallation.
In my experience, the bushings inside pulley wheels never wear out before the wheel itself develops tooth wear issues. Even then, not usually significantly worn out of round.
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Old 04-14-21, 08:36 AM
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Originally Posted by dsbrantjr View Post
When reinstalling the derailleur, did you correctly engage the "B" screw with the tab on the derailleur mount?
My thoughts precisely.
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