The Shimano Dura-Ace BB-R9100 is a premium Hollowtech II threaded bottom bracket for 68mm BSA road frames.

• Fits 68mm BSA (English-threaded) shells
• For Hollowtech II cranks with a 24mm spindle
• Recommended for Dura-Ace FC-R9200, FC-R9100 and FC-9000 cranksets (incl. power meter versions)
• Anodised aluminium cups with small, lightweight steel ball bearings
• Approx. 65g
• Includes right and left bearing cups with bearings and centre sleeve