This is our M30 BB for installing a Praxis M30 crank into a BB86 Road frames, a BB90 MTB frame or BB92 MTB frame. Unique design in which the bearing outer race is also the outer press fit surface. Features For Praxis M30 spindle based cranks only. Not compatible with other 30 mm cranks. Compatibility: BB86 Road, BB90/BB92 MTB frames. (BB86: 86.5x41 mm; BB90: 89.5x41 mm; BB92: 92x41 mm). Material: Steel bearings. Spindle: M30 (30 mm Drive bearing /28 mm Non Drive bearing). Real weight: 58 g.