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. Ceramic bearings equal increased speed at a lower effort and increased durability MegaExo Alloy center sleeve with double o-ring seals Fits BB-8200 fits K-Force Light, SL-K Light, BB-8000 fits K-Force, SL-K cranksets Weight 92g