The Box Four Race Cranks feature a 2-piece design paired with an oversized bottom bracket interface. For durability and easy installation the 24mm spindle is pressed into the drive-side crank arm while the non-drive side crank arm features a 2 bolt pinch system for imcreased strength. Box's unique 4 bolt 104 BCD spider features a flex-resistant ring optimum performance. These cranks feature steel pedal inserts that require pedal washers and external sealed bearing BSA bottom brackets, both are provided in the box. ###section### Product Specs Crank Type: 2-Piece Drive Type: Bolt Drive Spindle Diameter: 24mm Drive Side: Right Side Drive Includes BB Bearings: No Weight: 900g (31.7oz) ###shogun-image-section### Colour: Black; Size: 170mm, 160mm, 165mm