Ceramic bearings equal increased speed at a lower effort and increased durability for your high end components. Independent testing shows speed increases approaching 4%, i.e. over 1km a rider can gain 20 40m for the same energy output. More than enough distance for a definitive win. MegaExo. Alloy center sleeve with double o ring seals. External oversized ceramic cartridge bearings. Forged and CNC machined external bearing cups. Finish: Anodized cups and sleeve. English threading 68 and 73mm BC 1.37 x 24T. Italian threading 70mm M36 x 24T. Fits: BB 8200 fits K Force Light, SL K Light, BB 8000 fits K Force, SL K cranksets. Weight: 92g.