Shimano XTR Hollowtech II SM-BB93 bottom bracket

The new Shimano XTR bottom bracket with new seals, reduced weight and high-quality industrial bearings.

BSA threaded bottom bracket shell

The BSA bottom bracket shells have a width of 68–73 mm and a thread of 1.370 × 24 TPI, 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. Adjustment to the different shell widths is achieved using the washers included in the delivery.

Shimano Hollowtech II 24 mm MTB crank axle:

The Shimano Hollowtech II crankset system has a solid 24 mm axle. The MTB cranksets have a 120 mm long crankset axle. The DH Saint and Zee cranks for 83 and 100 mm installation widths have longer axles and will only fit frames with correspondingly wider bottom bracket shells. The respective bottom brackets are compatible with one another.

Shimano XTR SM-BB93 bottom bracket dimensions

• Aluminium threaded bottom bracket cups
• BSA thread, 34 mm x 1.37 TPI
• Installation width 68–73 mm
• Thoroughly sealed
• Includes three 2.5 mm washers for adjustment to 68/73 mm bottom bracket shells

All Shimano Hollowtech II bottom brackets are compatible with all Hollowtech II MTB cranksets. You can also fit an LX crankset with an XTR bottom bracket, or vice versa. Adjustable to 68 and 73 mm bottom bracket shells using the spacer rings. Also compatible with E-type derailleurs and chain guides. Please note that to install the bottom bracket, the frame thread must be cleanly re-cut and the sides of the frame housing must be planed flat. 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