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. 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.
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5 stars
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So far so great, a great component
This will make my bike a best bike.
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Reviewed 9/6/2018
by JIM
Cycling Enthusiast
Farmington, MI
Value Rating
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5 of 6 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
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Easy to install
Anybody can install this with necessary tools
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1 of 2 customers found this review helpful.
Perfect fit.
Not much to report. Works great and silent. Easy install and looks better than the 15 yo original. The Park Tool BBT 9 bottom bracket tool made it a piece of cake.
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1 of 1 customers found this review helpful.
Perfect fit.
Not much to report. Works great and silent. Easy install and looks better than the 15 yo original. The Park Tool BBT 9 bottom bracket tool made it a piece of cake.
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Easy install
Glad I went ahead and did it myself. Fit perfectly, and looks better than the original.
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Reviewed 3/13/2023
by WontontoIsBiking
Cycling Enthusiast
Philadelphia, PA
Works like a charm!
Used this for a new gravel bike build. I had never installed a bottom bracket before and this was very simple and straightforward. Came greased and ready to install. Because of the factory grease, it doesn't spin extremely free to start, but it's loosening as it breaks in.
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Upgrade!
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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Great Shimano quality!
Finally replaced my 6700 BB. Super easy install and bulletproof. Looking to get another 7 years out of BB.
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Reviewed 9/22/2017
by CDLvelo
Cycling Enthusiast
Surrey, BC
13 of 13 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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A guide to bottom bracket standards.
