48mm

The Box One Oversized 31.8mm Front Load Stem-1 1/8" are engineered for larger racers and designed specifically to increase pedaling stiffness. The ...

The Box One Top Load 31.8mm Bar Bore Stem features design and engineering elements that make this the perfect stem for larger sized racers looking ...

The Box Two Center Clamp Stem-1 1/8" is a brilliantly designed cold forged aluminum stem. Box has moved the rear pinch bolts to the front of the st...

The Box Two Front Load Stem has been engineered specifically for BMX racing. With a 22.2mm clamp this stem is machined from cold-forged aluminum. W...

The Box Two Top Load Stem are cold forged for strength and then CNC machined to achieve Box’s exacting tolerances. Available in multiple colors and...

PRODUCT DETAILS The new 31.8 Banger stem is the world’s first front-load stem with a 31.8 Ø clamp for BMX racing and freestyle. Availabl...