Shimano Dura Ace bottom bracket

A silky-smooth ride and even better seals characterise the new Dura Ace bottom bracket. The Dura Ace bearing cups for the Shimano Dura Ace Hollowtech II crankset. The new Dura Ace bottom brackets have narrower cups, so the TLFC34 tool is required for installation.

BSA Threaded Road Bottom Bracket Cages

The BSA road bike bottom bracket shells have a width of 68 mm and a 1.370 × 24 TPI thread, with an outer diameter of 33.6–33.9 mm, into which the bearing cups are screwed. Both bearing cups are screwed in the direction of travel. The different shell widths are accommodated using the washers included in the delivery.

Shimano Hollowtech II crank axle 24 mm – road bike:

The Shimano Hollowtech II crankset system features a solid 24 mm axle. The road bike cranks have an axle length of 110 mm. This axle system is also used on the FSA Megaexo road bike cranks. The respective bottom brackets are compatible with one another. Due to the shorter axle, the road bike cranks are only compatible with road bike and gravel frames

Shimano Dura Ace SM-BB9100 bottom bracket technology:

• BSA thread, installation width 68 mm
• Aluminium threaded cup bearings
• BSA thread, 34 mm x 24 tpi / 1.375" x 1.06 mm
• Installation width 68 mm
• Industrial bearings with elaborate sealing
• Recommended tool: TL-FC34

All Shimano Hollowtech II road bike bottom brackets are compatible with all Hollowtech II road bike cranksets. You can also fit a 105 crankset with a Dura-Ace bottom bracket, or vice versa. Please note that to install the bottom bracket, the frame thread must be cleanly re-tapped and the sides of the frame housing must be planed. Otherwise, the bottom bracket will have a short service life.

Herstellerinformation: SHIMANO INC., 3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan, www.shimano.com | EU contact: Shimano Europe BV, High Tech Campus 92, 5656 AG Eindhoven, The Netherlands, www.shimano.com