This BB is for installing a Praxis M24 or SRAM GXP steel spindle MTN crank in either BB30 or PF30 73mm MTN frame. FEATURES: For M24 / GxP steel spindle cranks being installed in a 73mm BB30 / PF30 MTN frame. Forged & machined heat-treated 7075 T6 Aluminum Enduro 2437 Drive /2237ER Non-Drive steel bearings 73mm version is only for MTN. Press tool, and 2 Praxis M30 BB tools required for installation SPECS: Interface: 24/22mm stepped spindle Shell: BB30/PF30 (includes sleeve for BB30 installation) Width: 73mm' Weight: 149g +/- with included sleeve