5DEV Bottom Brackets are jewelry for riders who ride hard. For the core cyclist chasing every watt and every detail this is the ultimate BB. CNC-machined titanium bearing cups a CNC-machined 6061 aluminum internal sleeve and XD-15 ceramic-hybrid ABEC-5 bearings deliver glass-smooth spin brutal durability and zero-drama performance in all weather. Designed and machined in San Diego it's engineered speed with showpiece finishTitanium cups for strength precision fit and corrosion resistanceXD-15 ceramic-hybrid ABEC-5 bearings deliver glass-smooth spin brutal durability and zero-drama performance in all weatherSeals built for grit pressure washing and real-world racing6061 sleeve for stiffness and perfect bearing alignment