Thomson X4 31.8 Bicycle Stem

Currently Unavailable

Material: aluminum
Length: 50 mm 70 mm, 90 mm 100 mm, 110 mm 120 mm, 130 mm
Rise: 10 deg, 0 deg


The Thomson X4 Stem is stronger and lighter than their older Elite stem. A good a part of this weight savings comes from the change in design. Where the Elite used an internal wedge clamp, this X4 is determined by a more traditional split clamp for the steerer interface. Even as it meant losing the knee-saving shape at the Elite, the clamp bolts are pretty minimal given the sculpted design. The Thomson X4 Stem is CNC machined from 7000 series aluminum alloy. It has a 31.8mm clamp diameter. It is to be had in Black or Silver and with a zero (90) or ten (one hundred) degree upward push.

Product Features

  • Material: 7000-series aluminum
  • Bar Diameter: 31.8 mm
  • Steer Tube Diameter: 1.125 in
  • Length: 50 mm, 70 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm
  • Rise: 0 deg, 10 deg
  • Bar Attachment: 4-bolt
  • Weight: 174 g
  • Recommended Use: XC, freeride
  • Manufacturer Warranty: 3 years

31.8 bar clamp diameter with smooth edges for carbon bar compatibility
Machined 7000 series extruded bar stock
Bolts are custom heat treated with corrosion preventative plating
Stack height is 41mm
Use SM5320 to evolve 1-1/8″ threadless stem to at least one” threadless steerer

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