The new has a 45-degree top-load design for BMX racing. Available in millimetre extensions, the stems are cold forged from the highest quality 6061-T6 aluminium then CNC machined to refine the shape and further reduce weight. 31.8 refers to the stem's diamter, so combine the with the bars for maximum gate pull and help stop latteral flex when you apply full boost on that second pedal. Lighter than many traditional 22.2 ’… the Impact 31.8's open design keeps weight low, while maintaining plenty of strength and the oversize 31.8 ’… clamp ensures that your bars stay put. Available in anodized red, blue, gold and black with laser-etched graphics.