AITA BB90 road ceramic bottom bracket is introduced by Trek for its 37mm ID frame shell and run 24mm spindle cranks, such as Shimano's. The BB90 road ceramic bottom bracket comes with a pair of 6805 AITA hybrid ceramic bearings. This BB90 hybrid ceramic bearings are 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 and will save 80% of the power compared with the steel bearings, plus the bearings will last 3-5 times longer.
2 year warranty.
Free shipping worldwide.
ABEC7 high chrome vacuum degassed bearing steel races with quenching and tempering hardening;
Grade 3 Si3N4 ceramic bearing balls;
Dual lips light contact rubber bearing seals;
Dust covers are provided
BB90 standard frame with 90mm width;
Shell inner diameter 37mm;
e.g. Trek Madone 7 series,Trek Madone 6 serie,Trek Madone 5 series,Trek Madone 4 series,Trek Domane 6 series,Trek Domane 4 series,Trek Speed Concept 9 series,Trek Cronus CX Ultimate frames; Willier Cento 1 frames etc.
24mm spindle cranksets:
e.g. Dura Ace 9000, Dura Ace Di2 (7900), Dura Ace (7900/7800), Ultegra 6800, Ultegra Di,Ultegra (6700/6600), Ultegra SL, 105 10 (5600/5700), Shimano Compact, FSA Gossamer etc, 24mm spindle cranks.
SRAM GXP 22-24mm crankset