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Bottom Brascket Bearing 6805 thickness

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Bottom Brascket Bearing 6805 thickness

Old 07-13-15, 12:54 PM
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Bottom Brascket Bearing 6805 thickness

This is an interesting one.
I disassembled a Hollowtech (II?) BB as the bearings were gnarly.
Number on the seal is 6805 RD.
The bearing is only 6mm thick.
Standard for the 6805 is 7mm.
I have seen a few 6mm thick 6805 bearings, but they are by far the minority.
I have seen 6805/W6 for the 6mm wide units.

It has been a while since I disassembled the cups. I cannot recall if there was any kind of spacer or external seal/shield
in the cup, but there are the plastic bushings for the bore.

I do not know if there is an extra 2mm to be found on the spindle to accommodate the thicker bearings.
Anybody have experience with this??

It may be cheaper to just purchase a new BB, but I have this need to know how things work.........
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Old 07-13-15, 01:32 PM
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here is a picture of one with the seal Off https://www.google.com/search?q=6805...lYGEdwEObDM%3A

they, external bearings in the threaded holder are fast to remove with the tool and a ratchet wrench .

a 3/8" drive beam torque wrench is Pegged before hitting the max installation torque ..

take the contaminated 1 off and put a New one On.. that is all I've ever done.

google found a tool to pull the bearing from the holder .. https://www.artscyclery.com/Wheels_Ma...-WM6805BE.html

Last edited by fietsbob; 07-13-15 at 01:59 PM.
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Old 07-13-15, 02:30 PM
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Originally Posted by fietsbob
a 3/8" drive beam torque wrench is Pegged before hitting the max installation torque ..
From what I have seen, max installation torque is 36ft/lbs, no?
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Old 07-13-15, 02:42 PM
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I'd have to look it up . be my guest. specs are on the web..

this is just what ! recall doing the job, last summer, on someones bike, at the bike shop.

1/2" drive beam torque wrenches also are a bit stiffer a shaft, so the needle is more on the scale.
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