Box ONE Bottom Bracket B52 35mm

BOX couldn’t ignore the truth about bottom brackets.
Traditional BBs lack the space needed for the stiffness and responsiveness modern riders demand. That’s why they developed the BOX B52 Bottom Bracket — bringing their signature Oversized Technology into your frame and breaking new ground in the bike builder’s world.

With a 52mm diameter and 80mm wide shell, the B52 allows for wider chainstays, boosting stiffness and enhancing efficiency through corners and sprints. Power transfer becomes more direct, feedback more immediate — you’ll go further, faster, with less energy wasted.

This is Oversized, the BOX way.
Stack as many Oversized components as possible and eliminate flex from your setup. The result? A faster, sharper, more responsive ride — built to BOX standards.

Check out the M35 cranks here.