Shimano Dura-Ace R9100 Hollowtech II - English Bottom Bracket

Shimano Dura-Ace R9100 Hollowtech II - English Bottom Bracket Shimano

Shimano Dura-Ace R9100 Hollowtech II - English Bottom Bracket

Shimano Dura-Ace R9100 Hollowtech II - English Bottom Bracket

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What Makes the Shimano Dura-Ace R9100 English Bottom Bracket Worth It?

The Shimano Dura-Ace R9100 threaded bottom bracket is Shimano's flagship road threaded BB, using an advanced seal construction that delivers noticeably smoother rotation than the Ultegra SM-BBR60, with small ball bearings that reduce rotational mass and contribute to the lower weight without sacrificing the durability that Dura-Ace requires. Built on the Hollowtech II outboard bearing platform, the BB-R9100 positions sealed cartridge bearings outside the frame shell for maximum stiffness and efficient power transfer on every pedal stroke, a critical advantage in sprint finishes and sustained climbs where drivetrain efficiency directly affects output.

English threaded 68mm shell. Compatible with Shimano Dura-Ace R9100 and R9200 cranksets using the 24mm Hollowtech II axle, and mechanically compatible with all other Shimano road Hollowtech II cranksets including Ultegra, 105, and GRX on English 68mm threaded frames. Installation requires a Shimano TL-FC36 or equivalent Hollowtech II BB wrench. Shimano also makes this BB in Italian threading for frames with 70mm Italian threaded shells. For riders building a Dura-Ace drivetrain on a traditional threaded English road frame who want the smoothest OEM rotation available in this interface, the BB-R9100 English is the correct choice.

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$45.99
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Specifications

  • Model: BB-R9100 (English)
  • Series: Shimano Dura-Ace R9100
  • Interface: Hollowtech II (24mm axle), threaded
  • Shell: English threaded, 68mm
  • Bearing Type: Outboard sealed, advanced seal construction with small ball bearings
  • Compatible Cranks: Shimano Dura-Ace R9100, R9200 and all road Hollowtech II cranksets on English 68mm threaded frames
  • Installation Tool: Shimano TL-FC36 or equivalent Hollowtech II BB wrench

FAQ

Is this compatible with Dura-Ace R9200 cranks?

Yes. The BB-R9100 English is listed by Shimano as compatible with both R9100 and R9200 Dura-Ace cranksets, which both use the Hollowtech II 24mm axle interface.

How does this compare to the Ultegra SM-BBR60?

The Dura-Ace BB-R9100 uses advanced seal construction and smaller ball bearings for marginally smoother rotation and lower weight compared to the SM-BBR60. For most riders the difference is very small, but for Dura-Ace builds it is the correct OEM spec.

Can this be used in a 70mm Italian-threaded frame?

No. This is the English 68mm threaded version. For Italian 70mm threaded frames, Shimano makes a separate Italian-threaded version of this bottom bracket. Make sure to order the correct threading for your frame.

Best For

Road cyclists with English 68mm threaded frames running Shimano Dura-Ace R9100 or R9200 cranksets who want the flagship OEM bottom bracket with advanced seal construction and the smoothest Shimano threaded BB rotation.

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