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Threaded Shimano Hollowtech II Bottom Brackets Road

Old 07-26-21, 08:14 PM
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Ryan1044
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Threaded Shimano Hollowtech II Bottom Brackets Road

I have a question.
I had to have my 2x10 crankset replaced. I previously had a treaded bottom bracket and wanted to stay with the threaded style.
Replacing the crankset was not a problem, but the only bottom bracket they could get their hands on, at the tim, was the Shimano RS500.
I know I can upgrade that with different manufacturers. I am not at that point yet.
My question is, how much difference/better are either the Shimano SM-BBR60 (Ultegra) or the Shimano BB-R9100 (DuraAce), compared to the RS500?
Thinking about life span of bearings, smoothness, and any thing else you would like to add.
Thank you in advance!
Ryan
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Old 07-26-21, 08:26 PM
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Andrew R Stewart 
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My understanding is that the bearings are (or were when these first came onto the market) the same. The outside finish and total weight changed with price.

BTW there's a swing back to threaded BB shells as this decades old design is proving to be a really good design after all. Andy
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Old 07-26-21, 08:42 PM
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You will not be able to tell any difference. However, bottom brackets are inexpensive. When this one wears out, treat yourself to an Ultegra or DA if you think it would look better with your other components.
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Old 07-27-21, 06:50 AM
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Originally Posted by Andrew R Stewart
BTW there's a swing back to threaded BB shells as this decades old design is proving to be a really good design after all.
Wonderful, seems like all the creaking has had some influence. I'm fine with square taper. Do hollow BBs require a larger threaded shell diameter to accommodate the bearings, and therefore a different standard size threaded shell from that of square tapers?
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Old 07-27-21, 07:04 AM
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Originally Posted by IPassGas
Wonderful, seems like all the creaking has had some influence. I'm fine with square taper. Do hollow BBs require a larger threaded shell diameter to accommodate the bearings, and therefore a different standard size threaded shell from that of square tapers?
Current Hollowtec 2 BBs place their bearings outside the shell, only their threaded skirt is inside. This allows for the BB axle to grow from the "classic" 16mm to the current 24mm. The T47 shells allow for the bearings to stay within the shell and still use the 24mm axle. The other reason for a builder to spec a T47 shell is that it's larger OD better fits OS frame tubes (or whatever the carbon structures are called as they are rarely tubes any longer). Andy
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Old 07-27-21, 07:24 AM
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Thank you all for the information!
The Mechanics page is always my first stop when I log onto the forum. The knowledge is awesome to read and is very much appreciated!

Thank you
Ryan
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