Race Face Team XC External Bottom Bracket Keep it spinning The high-end Race Face X-Type Team XC external bottom bracket has been totally redesigned and upgraded! Bearings, sealing and machining precision have all been improved to create a smoother-running, longer-lasting BB that is now fully-serviceable! Including cryogenically-treated, black oxide-coated races, with a premium bearing design that utilizes grade 5 chromium steel ball bearings, keeping things spinning smoothly for seasons to come. Still interchangeable with all current and past Race Face external BB cranksets, as well as select Shimano and FSA external mountain BB systems with 24mm diameter spindles. Features Compatible with common bottom bracket standards 68 and 73mm wide bottom bracket shells with BSA threading Highly-durable cryogenically treated, black oxide-coated races Premium bearing design using grade 5 chromium steel ball bearings Injected with Phil Wood waterproof grease for long-lasting lubrication Includes bottom bracket spacers to dial-in the perfect adjustment | Race Face | Team Xc X-Type Bottom Bracket 68/73Mm, External Bottom Bracket