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Old 11-09-08, 08:19 AM   #1
spinnaker
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Replacing pulleys on rear derailer?

One of my friends damaged a pulley on his rear derailer. He contacted two LBSs and both told him the whole derailer would need to be replaced.

I have removed these several times myself for cleaning. It is easy to do.

Is it really true that replacing these pulleys require the replacement of the whole derailer?

It looks like I found them here.


I am about 99.9% certain that he has a Shimano RD, I am not as certain of the model, I would guesss a 105. Would these work for him? Which one would he use? Yeah I know, count the teeth but what are the numbers in the description, how does that relate to the type of derailer he has.

Last edited by spinnaker; 11-09-08 at 08:29 AM.
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Old 11-09-08, 08:35 AM   #2
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Also check Velo Orange.......
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Old 11-09-08, 08:40 AM   #3
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Also check Velo Orange.......

So does that mean they can be replaced? If so, how do I determine the proper type of pulley? Does it matter as long as thaey are Shimano compatible and have the same number of teeth?
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Old 11-09-08, 09:16 AM   #4
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So does that mean they can be replaced? If so, how do I determine the proper type of pulley? Does it matter as long as thaey are Shimano compatible and have the same number of teeth?
You might want to ask yourself if this derailleur is expensive enough to warrant a pulley replacement. You can probably pickup a spare one at your LBS for $10 but if the R.D is worn out, shot or garbage quality then it isn't worth it.

If it is what you say it is, a 105 R.D then i'd go ahead and get a replacement part. Your LBS should be able to order direct from shimano if they don't already stock it. Other companies make compatible pulleys as well.

http://www.jensonusa.com/store/produ...r+Pulleys.aspx

You need to know model #, amount of teeth and whether it's upper/lower. The cage takes a 3mm allen key to seperate. Installation is a piece of cake.

Last edited by operator; 11-09-08 at 09:19 AM.
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Old 11-09-08, 09:27 AM   #5
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I believe the pulley width is narrower for 9 and 10 speed marked deraillers. I used to think they were all the same until I saw a DA RD pulley. At $25 plus shipping, it would need to be a fairly high end derailler to be worthwhile.
You could also look at Tacx replacement pulleys, CAD30 + tax at my LBS some years ago.
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Old 11-09-08, 09:43 AM   #6
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You need to know model #, amount of teeth and whether it's upper/lower. The cage takes a 3mm allen key to seperate. Installation is a piece of cake.
There is a difference between upper and lower? OK, let's say I have another friend that took his apart for cleaning and was not careful enough to mark them (I of course am always careful ) , how would you tell the difference?
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Old 11-09-08, 09:52 AM   #7
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I believe the pulley width is narrower for 9 and 10 speed marked deraillers.
I don't see how pulley width would matter. All 3/32 chains have the same internal diameter 7,8,9,10.
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Old 11-09-08, 09:56 AM   #8
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If the derailer is of decent quality and in good shape then replacing the pulley makes sense since they cost a fraction of what a new unit is worth and the job is simple enough for nearly anyone to do.
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Old 11-09-08, 12:55 PM   #9
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$25 for ONE pulley!!!???

This is probably why the LBS said to just buy a new derailleur. It probably cost less than the $50 for the two replacement pulleys.

I'd say get aftermarket replacements. You can get a pair of sealed bearing pulleys for $20.
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Old 11-09-08, 01:43 PM   #10
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$25 for ONE pulley!!!???

This is probably why the LBS said to just buy a new derailleur. It probably cost less than the $50 for the two replacement pulleys.

I'd say get aftermarket replacements. You can get a pair of sealed bearing pulleys for $20.
That was probably not the best example to pick - the point of the link was to show that they are available. Replacement pulleys are $10-$20.
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Old 11-09-08, 02:17 PM   #11
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There is a difference between upper and lower? OK, let's say I have another friend that took his apart for cleaning and was not careful enough to mark them (I of course am always careful ) , how would you tell the difference?
The upper pulley is designed with side-to-side float (on Shimano derailleurs) and should say CENTERON G-PULLEY on it.
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Old 11-09-08, 02:40 PM   #12
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Geesh! Glad I keep a bunch of old derailleurs laying about in a box - with their pulleys. I've swapped 'em out many times. Both for myself and for others. $25/each? Unreal.
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Old 11-09-08, 03:06 PM   #13
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$25/each? Unreal.
Open up a Dura-Ace or XTR upper pulley, and you'll see why they're expensive And compared to ceramic-bearing pulleys, at about $130-160 per pair, $25 is not that bad.

Last edited by mechBgon; 11-09-08 at 03:31 PM.
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Old 11-09-08, 03:18 PM   #14
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The upper pulley is designed with side-to-side float (on Shimano derailleurs) and should say CENTERON G-PULLEY on it.

So upper will say "CENTERON G-PULLEY" and the lower will not? Is this on the 105?
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Old 11-09-08, 03:28 PM   #15
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So upper will say "CENTERON G-PULLEY" and the lower will not? Is this on the 105?
You should see G-PULLEY. The exact details may depend on the generation of 105 derailleur you've got, assuming it actually is a 105. The important thing is that it has side-to-side float, because the bushing is wider than the journal it rides in. That's simple to confirm by hand.

edit: pic of the 10-speed 105 RD pulleys. The one at the right is the upper pulley.


Last edited by mechBgon; 11-09-08 at 03:36 PM.
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Old 11-09-08, 04:54 PM   #16
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Thanks a lot!


So both bushings should be the same width and if "my friend inserts the bushing in the center of both pulleys, "he" would see that the bushing sticks out a bit further on one of them?
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Old 11-09-08, 05:09 PM   #17
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Thanks a lot!


So both bushings should be the same width and if "my friend inserts the bushing in the center of both pulleys, "he" would see that the bushing sticks out a bit further on one of them?
That's right, the bushings themselves are interchangeable on this set of pulleys.

Last edited by mechBgon; 11-09-08 at 08:33 PM.
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Old 11-10-08, 07:57 AM   #18
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Reasonable ones here
http://www.niagaracycle.com/index.ph...er_id=&sort=3a
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Old 08-27-09, 06:06 PM   #19
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sorry to bring this old topic back...but im thinking about replacing my pulleys too. i have a shimano sora 8spd ...and the tension pulley has 11t...i cant seem to find that anywhere...

does ultegra/sora work if its a pulley with 11t? or does it have to be a sora brand?...thanks for anything advice!
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Old 08-27-09, 06:15 PM   #20
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It's stories like this that make me yearn for the older Huret deraillers. They have ball-bearing jockey pulleys that you can take apart, clean, and relube. The really old versions had METAL pulleys! They last pretty much forever. Which is why they don't make them anymore - not enough "planned obsolescence" to pump up the repeat sales department.
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Old 08-27-09, 06:24 PM   #21
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It's stories like this that make me yearn for the older Huret deraillers. They have ball-bearing jockey pulleys that you can take apart, clean, and relube. The really old versions had METAL pulleys! They last pretty much forever. Which is why they don't make them anymore - not enough "planned obsolescence" to pump up the repeat sales department.
Even the old Campy derailleurs had metal pulleys with ball bearings. But by the late 60s everybody had moved to plastic pulleys with sleeve bearings.
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Old 08-27-09, 08:36 PM   #22
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ok? apparently shimanos are not metal...any info on my question though?
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Old 08-28-09, 02:17 PM   #23
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sorry to bring this old topic back...but im thinking about replacing my pulleys too. i have a shimano sora 8spd ...and the tension pulley has 11t...i cant seem to find that anywhere...

does ultegra/sora work if its a pulley with 11t? or does it have to be a sora brand?...thanks for anything advice!
This took me 10 seconds of searching:
http://www.performancebike.com/bikes..._400002_400185
but a whole Sora derailleur could cost less...
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Old 08-28-09, 05:29 PM   #24
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Even the old Campy derailleurs had metal pulleys with ball bearings. But by the late 60s everybody had moved to plastic pulleys with sleeve bearings.
I didn't know Campy did the same thing. I assumed, but didn't know for sure.
Why make something last when you can make it self-destruct so people have to buy another.....and you know they won't complain about it?
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Old 08-28-09, 06:47 PM   #25
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Even the old Campy derailleurs had metal pulleys with ball bearings. But by the late 60s everybody had moved to plastic pulleys with sleeve bearings.
I have an XT RD purchased in the '90's with ceramic bushings on the upper pulley, and metal bushings on the lower.
I have an XT RD purchased a couple years ago with ceramic bushings on the upper pulley and cartidge bearings in the lower.
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