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Shimano Dura-Ace BB-R9100 Bottom Bracket

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The Shimano Dura Ace BB-R9100 Bottom Bracket shares the same performance enhancing features as the previous 9000-series bottom bracket, using small diameter bearings to shave weight, reshaping the cones for better durability, and improving the seals to reduce friction while maintaining the same water and debris resistance.

Available in English-threaded 68 mm shell and Italian-threaded 70 mm shell-width versions. Includes TL-FC24 adapter for use with standard external bottom bracket tools designed for 44 mm OD cups. Compatible with the 24 mm spindles found on Hollowtech II cranks. Claimed weight is 65 g.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

Bottom Bracket STD: English (BSA) 

BB9100 - English Thread

Mfg PartNum: IBBR9100B 

BB9100 - Italian Thread

Mfg PartNum: IBBR9100I 

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Reviewed 9/6/2018
by JIM
Cycling Enthusiast
Farmington, MI
Value Rating
Overall Rating
2 of 3 customers found this review helpful.
Dura Ace, the only way to fly.

Like all Shimano Dura Ace gear, its top of the line. I was a bit surprised after installing it that the bearings seemed a little tight....not as free spinning as I'd expected.That said, it is very smooth. I expect that the bearings will ease up as I get more miles on them. I was replacing an old 7800 BB and that would have been impossible without the accompanying adapter. Not all sellers provide that adapter but they did. Thanks!

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Reviewed 8/16/2018
by Anonymous
Cycling Enthusiast
Value Rating
Overall Rating
Easy to install

Anybody can install this with necessary tools

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Reviewed 6/10/2019
by Anonymous
Overall Rating

Decided to do a big upgrade from an octalink BB to the dura-ace BB. Easy DIY project and now the bike is spinning smooth as butter. Great price and super fast shipping, you cant beat that!

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Reviewed 9/22/2017
by CDLvelo
Cycling Enthusiast
Surrey, BC
Overall Rating
10 of 10 customers found this review helpful.
Dura Ace is the way to go

Installed for my Dura Ace 7800 crankset. Installs easily, silent and smooth. Replaced my DA 7900 BB which had aftermarket ceramic hybrid bearings installed. The no load spin test is impressive. Real world, the Dura BB 9100 (or 7900 or 9000) is much better - smoother, quieter, less friction - yes folks... ceramics are not the best for low rpm (less than 10,000) applications. Ceramic hybrids wear poorly and create slop, noise, and increase friction. After several experiments and years of trying ceramic hybrid bearings, I'm sticking with DA stock (BB, derailleur pulley, and wheels).

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