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Promax Oversized Impact Stem

31.8mm Clamping Area, Only compatiable with 31.8mm Stems!

The new 31.8 Impact stem has a 45-degree top-load design for BMX racing and freestyle. Available in 48-, 53- and 60-millimeter extensions, the stems are cold forged from the highest quality 6061-T6 aluminum then CNC machined to refine the shape and further reduce weight.

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 Ø clamp ensures that your bars stay put.

Available in anodized red, blue, gold and black with laser-etched graphics. Use the Impact 31.8 with the BOX Maximus bars for maximum gate pull. Meets or exceeds ENBMX standards. 

  • 48mm: 242 grams/8.5 ounces
  • 53mm: 250 grams/8.9 ounces
  • 60mm: 264 grams/9.3 ounces
  • Stack height 30.5mm