Promax HF-2 Crankset - 175mm 24mm Spindle 2-Piece BlackPromax HF 2 Crankset 175mm 24mm Spindle 2 Piece Black. HF 2 cranks are Promaxs top of the line crank offering. Hollow forged from 6061 T6 aluminum both crank arms are hollow so they are super stiff yet lightweight. The crank arms spin on a beefy 24 millimeter spindle permanently fitted into the drive side arm. 104mm BCD Laser etched graphics Bottom bracket sold separately Pedal washers included Chainline: 43 Q Factor: 167 Will not fit English x 73mm