AITA BSA Shimano road ceramic bottom bracket is fully compatible with Shimano Dura Ace, Ultegra and FSA 24mm spindle crankset. It is an English thread bottom bracket with AITA signature hybrid ceramic bearings built up with Grade 3 Si3N4 ceramic balls and ABEC7 hardened steel races.
With the Grade 3 Si3N4 ceramic balls (8 times rounder and 4 times smoother than the steel's), spinning on the hardened ABEC 7 races, AITA's ceramic bearings run much smoother than most of the bearings in the market. This ceramic bottom bracket only consumes 21% of the power vs Shimano Dura Ace 7900, Dura Ace 9000 and Ultegra in average, plus the bearings will last 3-5 times longer than the steel bearings.
Unique designed dust cover improves the durability of the bottom bracket compared with the traditional Shimano design.
2 year warranty.
Free shipping worldwide.
CNC aluminium external bottom bracket cups;
ABEC7 high chrome vacuum degassed bearing steel races with quenching and tempering hardening;
Grade 3 Si3N4 ceramic bearing balls; Nylon bearing retainer;
Dual lips light contact rubber bearing seals;
BSA 1.37"x24TPI English Thread;
24mm spindle cranksets;
i.e. Dura Ace (9000), Dura Ace Di2 (7900), Dura Ace (7900/7800), Ultegra Di, Ultegra (6800/6700/6600), Ultegra SL, 105 10 (5600/5700), Shimano Compact, FSA Gossamer etc.