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Upper pulley tight on Ultegra 6700 rear der

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Upper pulley tight on Ultegra 6700 rear der

Old 10-06-15, 10:13 AM
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MikeD1
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Upper pulley tight on Ultegra 6700 rear der

The upper pulley is on a ceramic bushing and the lower is a sealed bearing. Lower spins easy, upper "drags" for lack of a better word. Ordered a new set, and the new upper is just as "tight" as the old one! Is there any reason why I can't use the easier rolling lower, sealed bearing in place of the ceramic bushing one?
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Old 10-06-15, 12:39 PM
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Originally Posted by MikeD1 View Post
The upper pulley is on a ceramic bushing and the lower is a sealed bearing. Lower spins easy, upper "drags" for lack of a better word. Ordered a new set, and the new upper is just as "tight" as the old one! Is there any reason why I can't use the easier rolling lower, sealed bearing in place of the ceramic bushing one?
The top pulley used to float a tiny bit, so they were not interchangeable.
The current 9000/6800 generation doesn't float.
I didn't own the 6700 generation, so not sure about those.

But, you can get the Dura Ace pulleys from the same generation and both are sealed bearings, not a bushing.
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Old 10-06-15, 12:48 PM
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take it out, clean it and put it back together? ..

to use a sealed bearing upper pulley Shimano like in function the companies made a bushing wider than the pulley bearing width.

the extra slop sideways, was along that bushing .. the bearing itself , a radial contact , moves as a whole.
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Old 10-06-15, 04:54 PM
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The replacement 6700 pulleys I ordered just came in. The top floating pulley has a rubber lip seal that adds friction that impedes rotation. I don't think that it will be an issue after it breaks in. Just make sure that the lip of the seal is not folded over after assembly.
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Old 10-06-15, 05:29 PM
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WE often take apart and clean/grease the pulleys of Shimano ders. The Ultegras with their "rubber" seals do spin tightly when gritty or dry. Andy.
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Old 10-06-15, 05:45 PM
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I think you are making much ado about nothing. The light drag won't slow you down.
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Old 10-07-15, 07:41 AM
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Originally Posted by Secret Squirrel View Post
The replacement 6700 pulleys I ordered just came in. The top floating pulley has a rubber lip seal that adds friction that impedes rotation. I don't think that it will be an issue after it breaks in. Just make sure that the lip of the seal is not folded over after assembly.
My replacement pulleys look just like the originals also. Thing is, after 2400 miles, taking apart, cleaning, relubing numerous times, they still have the same friction. I think it is that rubber lip . . . I know it's not slowing me down, just bugs me that my 30 year old Shimano 600 drivetrain spins easier than this Ultegra setup.
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Old 10-07-15, 09:51 AM
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Originally Posted by MikeD1 View Post
My replacement pulleys look just like the originals also. Thing is, after 2400 miles, taking apart, cleaning, relubing numerous times, they still have the same friction. I think it is that rubber lip . . . I know it's not slowing me down, just bugs me that my 30 year old Shimano 600 drivetrain spins easier than this Ultegra setup.
Just as classic cup and cone BBs spin easier then modern cartridge bearing (with contact seals) do. I do find it interesting how perceptions evolve over the years. What was at one time considered bad is now marketed as being good. Andy.
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