IRD Scramjet BSA Threaded Bottom Bracket 288649

- External BSA, English threaded bottom brackets featuring a unique self-cleaning hybrid ceramic bearing system for the ultimate in strength and durability\n- Cartridge bearing system features a single ceramic ball with the remainder being steel with steel races, combining the strength of steel and the bearing life of ceramic\n- Single ceramic ball bearing pulverizes contaminates, reworks and polishes the steel races with every rotation \n- Offered in 24mm (Shimano, FSA, Race Face, etc) with an expandable sleeve that fits 68mm to 100mm shells\n- Bearings include a 5 year warranty