Box One Oversized B52 Bottom Bracket - Black 49mm ERD: 547mm

ERD: 547mm

with a metal to metal Echo-designed locking feature that requires pressure from BOTH sides to release

Volume: 63

The Box One brake arms are cold forged from 6061-T6 aluminum

and will not fit over 30 mm spindles

Box One Oversized B52 Bottom Bracket - Black 49mm ERD: 547mmTraditional BBs lack the space necessary for the pedal stiffness you deserve; that's why Box designed the B52 Bottom Bracket to bring Oversized Technology into your bike frame, breaking the mold in the bike builder's world. With a 52mm x 80mm wide BB shell, your bike gains wider chainstays, enhancing efficiency during cornering and acceleration. Your power delivery becomes more efficient, and feedback becomes more responsive. In summary, you'll need