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Box Centre Clamp Front Load Race Stem Black

Brand: Box

Code: ASBX2C848K

Code: ASBX2C853K

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Brand: Box

Box Two Centre clamp Hollow stems are cold forged from the highest quality 6061-T6 aluminium available. Featuring an open skeletal design and a dual mid-bolt wedge mounting system, they are lightweight yet maintain a very high level of strength. A 53mm extension stem weighs just 218 grams/7.7 ounces. By removing the rear pinch bolts and moving the mounting bolts to the middle of the stem, we reduced the weight and size and eliminated a serious hazard to the rider’s knees.

These stems come with either a 48 or 53mm extension and a 22.2mm bar bore. To ensure proper clamping force, the stem must be mounted on a fork with at least 45mm of exposed steerer tube.


  • Lightweight Skeleton Design
  • Knee-Saving Wedge Centre Clamp System
  • Superior Strength


  • Material: Cold-Forged 6061-T6 Aluminium
  • Hardware: Chromoly Clamping Bolts
  • Finish: Anodised w/Laser-Etched Graphics
  • Length: 48mm, 53mm
  • Clamp Diameter: 22.2mm
  • Stack Height: 28mm

This stem can be installed either side up to give a 5-degree rise or drop.

Note: Not compatible with forks that have carbon fibre steerer tubes