The Wheels Manufacturing T47A Bottom Bracket is specially designed to fit your Cervelo, Felt, or Factor BB shell. It fits a 24mm spindle compatible cranks. The machined aluminum cups thread directly into the frames BB shell, making it easy to install. Cups are similar to BSA interfaces with a left hand thread on the drive side and a right hand thread on the non-drive side. These cups have internal ABEC-3 bearings which can easily be serviced or replaced. It comes with a sleeve that fits between the cups for added protection from dirt and grime as well as prevention of contact from hoses or cables. The Wheels Manufacturing T47A Bottom Bracket is efficient and reliable for your compatible frame.