The Answer BMX Dual Length stem features a unique adjustable length steerer tube spacer that allows for two different reach options in one lightweight package. CNC machined from 6061 aluminum with slotted sides and rear section, machined underside to further reduce weight, chamfered edges and laser-etched logos. STEM SIZE Reach Weight Stack Height Rise Bar Clamp Bolts Steer Tube Pinch Bolts Mini 1 35mm / 40mm 6 oz 30mm 21mm (Upright) / 9mm (Invert) 6x1mm (x4) 8×1.25mm (x2) Expert 1 40mm / 45mm 7.8 oz 30mm 21mm (Upright) / 9mm (Invert) 6x1mm (x4) 8×1.25mm (x2) Pro 1-1/8 45mm / 52mm 8 oz 30mm 21mm (Upright) / 9mm (Invert) 6x1mm (x4) 8×1.25mm (x2) Pro XL 1-1/8 50mm / 57mm 9.2 oz 30mm 21mm (Upright) / 9mm (Invert) 6x1mm (x4) 8×1.25mm (x2)