Shimano Dura-Ace BB-R9100 Bottom Bracket
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Shimano Dura-Ace BB-R9100 Bottom Bracket
Shimano Dura-Ace BB-R9100 Bottom Bracket Info
The Shimano Dura-Ace BB-R9100 Bottom Bracket is the threaded bottom bracket built around Shimano's 24mm spindle standard — a straightforward, reliable interface that keeps the drivetrain stiff and the bearings well-protected. External cups house sealed ball bearings, with the wide bearing spacing designed to maximise stiffness at the crank-to-frame junction where torsional loads are highest.
Available in both English (68mm) and Italian (70mm) thread standards, the BB-R9100 is compatible with any Shimano 24mm thru-axle crank — including current and previous generations of Dura-Ace, as well as Ultegra and 105. Each cup is marked with directional arrows to take the guesswork out of installation. The unit weighs 65g, keeping the overall drivetrain package light without compromising durability.
Shimano Dura-Ace BB-R9100 Bottom Bracket Specs at a Glance
- Shell compatibility: English (68mm) or Italian (70mm) threaded
- Spindle compatibility: 24mm thru-axle Shimano cranks
- Bearing type: Sealed external cup ball bearings
- Weight: 65g
- Finish: Black
