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Old 08-26-11, 12:11 AM   #1
shivstroll
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Ultegra RD-6500 vs. RD-6600 vs. RD-6700 Pulley Compatibility

Sorry if this has been posted elsewhere but I couldn't find the answer using the search function.

I have an Ultegra RD-6500 rear derailleur which currently has a cracked guide pulley. I can buy new pulleys but they tend to be quite expensive for an RD-6500 set. In fact, RD-6600 and RD-6700 pulley sets are about half the price.

I know that RD-6600 and RD-6700 are designed with a 10 speed in mind so perhaps the pulleys are a bit different (perhaps thinner).

So my question is are RD-6600 and RD-6700 pulleys compatible with the RD-6500? If not, is there a generic source for RD-6500 pulleys or is it best to just bite the bullet and buy the expensive Shimano RD-6500 pulleys themselves?
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Old 08-26-11, 10:37 AM   #2
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The pulleys aren't any thinner for ten speed. The chain internal width does not change, only the external dimension.

Interesting question regarding compatibility though. My guess is that you can likely interchange them though you may need the specific bolt set to go with the pulleys. I have both 6500 and 6600 rear deraillers on different bikes and might get a chance to take a look at them this weekend. If you can wait that long, I'll let you know what I find.
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Old 08-26-11, 12:34 PM   #3
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If you get a chance to look, that'd be great.

There's nothing wrong with the bolts I have on the derailleur now so assuming the pulleys have the same hole size I don't think that'd be an issue.
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Old 08-26-11, 01:02 PM   #4
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My thought is that the hole size may be different to deal with different bearings. I'll try to confirm for you though.
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Old 08-26-11, 03:52 PM   #5
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There are off-brand replacement pulleys that don't come with bolts that are designed to work for just about any RD. This leads me to believe diameter of the pulley holes and bolts are standard and that 6600/6700 pulleys are compatible with 6500 RD.
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Old 08-27-11, 05:24 PM   #6
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Here's all you need. http://www.cycleclubsports.com/p-649...r-pulleys.aspx
I've got them on my 6500 RD using a 10 speed chain/cassette. Sealed bearings (no dissassembly required for lube), durable and inexpensive. Better than the originals and work flawlessly.
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Old 08-27-11, 09:50 PM   #7
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Here's all you need. http://www.cycleclubsports.com/p-649...r-pulleys.aspx
I've got them on my 6500 RD using a 10 speed chain/cassette. Sealed bearings (no dissassembly required for lube), durable and inexpensive. Better than the originals and work flawlessly.
I see they are designated upper and lower. Does the upper one have float?
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Old 08-28-11, 06:48 AM   #8
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I see they are designated upper and lower. Does the upper one have float?
I can't remember what the difference between top & bottom is but I believe neither has float which doesn't affect the shifting one bit.
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Old 08-28-11, 10:52 AM   #9
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I can't remember what the difference between top & bottom is but I believe neither has float which doesn't affect the shifting one bit.
Thanks for sharing these. Perhaps these are different, but the generic pulleys from Performance, which are not designated upper/lower and don't have float, didn't seem to work as well for me.
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Old 08-28-11, 07:37 PM   #10
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Thanks for the reply Crankycrank. I'll go ahead and order some of those pulleys.
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Old 09-04-11, 05:33 PM   #11
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I can't remember what the difference between top & bottom is but I believe neither has float which doesn't affect the shifting one bit.
Actually, the upper pulley on Shimano derailleurs has a touch of float in it, though the float isn't necessary to function properly (it simply makes the indexing a bit more fault-tolerant).

The big difference, IIRC, is that the 6500 series had 10-tooth pulleys, while the 6600 and newer have 11-tooth pulleys.
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