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Inventory subject to in-store stock. Please call, chat or email for the most up-to-date availability. 

Promax Banger Stem

Promax Banger Stem
  • Clamp Diameter: 31.8mm
  • Clamp Diameter: 31.8mm
  • Clamp Diameter: 31.8mm
  • Clamp Diameter: 31.8mm
Clamp Diameter:
Steerer Diameter:
Please select options
NOTE: "In store" availability on bicycles includes bikes fully built and bikes still in boxes. Please contact us via the live chat icon at the bottom of the page or call us at (303)444-4196 to confirm build status. ----------------This item is not permitted to be shipped, however it can be purchased online and picked up at your convenience. We are currently also offering City of Boulder Home Delivery for $10 on any purchase under $100 and free for anything over.

To use our $10 Local Delivery service, select it while viewing your cart or during the checkout process.
Please call us at 303-444-4196 with any compatibility questions! We are always happy to help.


Promax Banger stems have a front-load design and can be used with either side up, providing a 5-millimeter drop or rise. Available with 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.

- Stack height: 30.5mm

Part Numbers

Option UPC MPN
31.8mm / Blue / 53mm / 5mm / 1-1/8-inch 639266096412 PX-ST145331F-BL
31.8mm / Red / 48mm / 5mm / 1-1/8-inch 639266096351 PX-ST144831F-RD
31.8mm / Red / 53mm / 5mm / 1-1/8-inch 639266096436 PX-ST145331F-RD