HF-2 Crank Set 175mm HF-2 cranks are Promax’s 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. Features - 104mm BCD - Laser-etched graphics - Bottom bracket sold separately - Pedal washers included - Chainline: 43 - Q-Factor: 167 - Will not fit English x 73mm bottom bracket shells Specifications Bore: 24 Crank Arm Material: Aluminum Drive Side Compatibility: Right Hand Drive Chainring BCD: 104 Chainrings Included: No Crank Intended Use: BMX Crank Length (mm): 175 Pedal Spindle: 9/16" Spindle Material: Steel Crankset Style: 2-Piece Weight: 836g, BB Included: No