Race face turbine x type bottom bracketdurable serviceable light weight engineered for trail riders that want a high performance bb that lasts custom 6805 16 ball retainer bearings with titanium coated races that ensure unparalleled corrosion resistance bearings feature race face custom triple wiper seal to better retain grease and keep contaminants out bearings are factory filled with phil wood waterproof grease tested and proven to extend bearing life cups are forged and cnc machined f