The new 31.8 Banger and Impact stems are the world’s first front-load stem with a 31.8 Ø clamp for BMX racing and freestyle. Available in 48-millimeter and 53-millimeter extensions they are cold forged from the highest quality 6061-T6 aluminum then CNC machined to enhance the shape and further reduce weight. These stems only work with bars that have a 31.8mm clamping area.