Black Bearing B5 BB86 M30 (28mm/30mm) Bottom BracketThe Blackbearing bottom bracket range has been specifically developed to withstand the most extreme conditions. Suits BB86 frames and M30 (28 30mm) Praxis thru spindle type crank. Includes spacers and wave washer. Unique steel design in which the bearing outer race is also the outer press fit surface 30mm ID Drive bearing 28mm ID NonDrive bearing Suits BOX ONE M30 P, ONE M30 M, & BOX Vector Two M30 cranks only* Suitable for BB86 (41mm ID) BMX frames