Box Four Forged 2pc Race CranksThe 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