Bottom Brackets

Shimano's Dura-Ace Track Bottom Bracket features smooth-spinning, low-drag bearings for maximum power on the track. The Octalink spindle provides a stiff, high-efficiency platform for your next effort at the Hour Record.

Shimano's Ultegra bottom bracket uses Pro Tour-proven technology for lighter weight and super smooth spinning, while still maintaining the same level of durability and stiffness. It's available in English, Italian, or Press Fit models.

Includes two precision sealed bearings, aluminum cups, high-density plastic cone spacers, center tube spacer, sprocket adapter, adjustment washers, 19mm 8-spline spindle, and spindle bolts. Product Specifications - Type: American - Bearings: Sealed - Includes: BB Kit and Spindle - Weight: 21.5oz

Includes two precision sealed bearings, aluminum cups, high-density plastic cone spacers, center tube spacer, sprocket adapter, and plenty of adjustment washers. Product Specifications - Type: American - Bearings: Sealed - Includes: Cups, Bearings, Cones, Spacer, Washers - Weight: 10.5oz

This European type bottom bracket features four sealed cartridge bearings inside threaded aluminum bearing cups. Includes center tube spacer and plenty of adjustment washers. Product Specifications - Type: Euro - Bearings: 4x Sealed - Includes: Cups, Bearings, Spacer, Washers - Weight: 3.8oz

Kink bottom bracket kits include precision sealed bearings, machined dust cover cones, and all the spacers needed for perfect crank and chain alignment. The center tube spacer is a standard 51mm width so no additional internal spacers are needed, and on the off chance your frame requires a 48mm center spacer, it can be cut down using the cut guide machined into the spacer. TECH SPECS - Type: Mid - Material: 6061-T6 Aluminum - Bearings: Precision Sealed - Weight: 5.0oz(22mm)