Shimano Ultegra Bottom Bracket

The standard bottom bracket for Ultegra road bike Hollowtech II cranksets and bottom bracket shells with BSA threading. The new BSA bottom brackets have narrower races, so the TLFC37 tool is required for installation.

BSA threaded bottom bracket shell

The BSA bottom bracket shells have a width of 68–73 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 Ultegra SM-BBR60 Bottom Bracket Technical Specifications:

• Aluminium threaded bottom bracket cups
• 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-FC37

All Shimano Hollowtech II road bike bottom brackets are compatible with all Shimano 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