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do they sell parts for derailer rehab?

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do they sell parts for derailer rehab?

Old 07-16-12, 11:01 AM
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garage sale GT
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do they sell parts for derailer rehab?

I have a deore rear derailer that has gotten a bit slack. Do they sell new springs and jockey wheels? Do you have to just get a new one?
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Old 07-16-12, 11:12 AM
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jimc101
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If it has a part number, then technically you can order it, but for Deore level the parts will soon cost more than the whole replacement unit. See here for examples https://techdocs.shimano.com/media/te...9830670747.pdf

Jockey wheels are easy to replace, if you need a new spring, probably easier to get a new unit.
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Old 07-16-12, 11:42 AM
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dsbrantjr
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Jockey wheels are easily available and can be replaced. Springs which are not taken past their elastic limit (this doesn't happen in derailleurs unless the cage is wound up too far) typically do not go slack unless they are rusting away. Perhaps a good cleaning and lubrication will restore the derailleur to proper function.
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Old 07-16-12, 12:18 PM
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fietsbob
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Shimano obsoletes Derailleurs and such, every couple years , ..
AKA "new, improved"
But the pulleys can be replaced..
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Old 07-16-12, 02:36 PM
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garage sale GT
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thanks for the replies. I took the bike out in the snow a lot. I would lube up the derailleurs but I think you need to wash the salt out because a film of oil is only temporary protection.
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Old 07-16-12, 09:12 PM
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Derailluers do wear out around pivots and can get "sloppy" and no longer shift crisply and cleanly.
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Old 07-17-12, 07:24 PM
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My chain sags when I hit a larger bump. It almost seems to hit the ground. It just seems like the tension isn't as high.
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Old 07-17-12, 11:20 PM
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Originally Posted by dsbrantjr View Post
Springs which are not taken past their elastic limit (this doesn't happen in derailleurs unless the cage is wound up too far) typically do not go slack unless they are rusting away. Perhaps a good cleaning and lubrication will restore the derailleur to proper function.
Exactly.

Enough road dirt (and presumably off-road dirt is worse) in your pivots will increase friction in the upper and lower pivots enough that the corresponding springs can't respond to the chain slack and keep it taught. That happens _long_ before you put enough wear on the pivots to create indexing issues.

A bent and/or dirty rear derailleur cable housing can also keep the parallelogram spring from doing its job. Replacing the housing (for $2/foot from your LBS) is the right choice there.

Last edited by Drew Eckhardt; 07-23-12 at 06:56 PM.
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Old 07-17-12, 11:32 PM
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Originally Posted by garage sale GT View Post
My chain sags when I hit a larger bump. It almost seems to hit the ground. It just seems like the tension isn't as high.
Your upper and/or lower pivot are probably (very) dirty. Remove the derailleur, take out the mounting bolt, detach the cage, clean all the gunk off the upper and lower pivot parts, grease the parts, and put everything back together.

Last edited by Drew Eckhardt; 07-23-12 at 06:57 PM.
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Old 07-18-12, 09:39 AM
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Originally Posted by Drew Eckhardt View Post
Your upper and/or lower pivot are probably (very) dirty. Remove the derailleur, take out the mounting bolt, detach the cage, clean all the gunk off the outer and lower pivot parts, grease the parts, and put everything back together.
And when you do this there's half a chance you'll discover an extra hole for the end of the pivot spring, for more tension.

Also, I've improved both Campy and Shimano derailleurs by adding a washer in the upper pivot; both brands seem to have lateral slop in this location from new, IME (which doesn't include much from the last ten years).
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Old 07-18-12, 09:46 AM
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Used to be molded 'condoms' to cover the parallelogram part of RD's on muddy mountain bikes
Perhaps a replacement RD can be protected by slipping a section of inner-tube
over that part to keep salt and slush from rusting out the Return Spring,
and it can be well greased and since covered not attract more grit
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Old 07-18-12, 10:28 AM
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Seems of dubious merit. That might offer some protection to the return spring, but the complaint here is about the tension springs in the two main pivots. Which are pretty much always only going to be as protected as well as the factory managed, unless you slather it grease or something.
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