WALGUN BB30LS Press fit Ceramic Bike Bottom Bracket BB30 BB 30mm 24mm Dub 29mm pressfit 68mm 73mm Road MTB Crank Bicycle Parts (Black,30LS)WALGUN WGBB30 bike bottom brackets is fully CNC machined. The bottom bracket is made of ceramic ball bearings, The material of the bearing balls is silicon nitride ceramic balls, The bearings produced with this ..