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Ultegra 6600 Hubs

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Ultegra 6600 Hubs

Old 08-11-07, 12:21 PM
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AkAk2000
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Ultegra 6600 Hubs

I'm getting familiar with, and regreasing, a new set of Ultegra 6600 hubs, as well as truing and detensioning the new wheel (Mavic Open Pros). I've noticed there is quite a bit more drag on the hub, even after I've adjusted the cones properly. Like a few other Ultegra parts, I've isolated the cause as coming from the seals.

I realize that the drag is fairly negligible, and that it will probably diminish after the wheel wears in a bit. However, it is strange that I can't get the five or seven oscillations that I normally see from a lightly spun wheel in the bike shop, or on my existing wheels. The Shimano tech document for the front hub is here https://techdocs.shimano.com/media/te...9830608963.pdf.

There are four new o-rings that have been added to the hub over Ultegra 6500 hubs, two o-rings on each side. My questions are: what is the purpose of these o-rings, and should the o-rings be snugged up against the ends of the cones, or backed off a bit? Clearly, if the o-rings make contact with the cone, then this introduces additional drag into the system. But, I guess I trust Shimano engineers enough to try to install them the right way. It appears that they may have been in contact with the cones coming from the factory, but its very difficult to tell.
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Old 08-11-07, 10:31 PM
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Why would you want to regrease a new set of hubs?
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Old 08-12-07, 12:51 AM
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Originally Posted by ttopaz View Post
Why would you want to regrease a new set of hubs?
1. To make sure the bearings were adequately greased. Just because they're new, doesn't mean they've been assembled and prepped properly. I remember opening up the bottom bracket of a one-month old Bianchi once, and the bearings were as dry as dust.

2. Most newly assembled hubs have the cones adjusted too tight. As long as I was adjusting them, might as well back off the cones and see whats in there. It's only another couple of minutes.


Anybody, any insight on the purpose of the four o-rings and their proper placement?
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Old 08-12-07, 02:07 AM
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6600

Internal grease sleeve.

O-rings to keep grease from migrating to center of the hub from the bearings.
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Old 08-12-07, 08:26 AM
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https://techdocs.shimano.com/media/te...9830608963.pdf
https://techdocs.shimano.com/media/te...9830608914.pdf
https://techdocs.shimano.com/media/te...9830607316.pdf
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Old 08-12-07, 08:32 AM
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Originally Posted by ttopaz View Post
Why would you want to regrease a new set of hubs?
Because my new 105 hubs had an extra bearing on one side of the rear hub.
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Old 08-12-07, 01:14 PM
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I see, you are bored.
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