Elite 31.8mm X4 Stems



The X4 starts life as a one-piece 7000 series extruded billet precision solid block of aluminum.

Our vision of the perfect stem… the X4 is the purist combination of strength, weight and CNC precision. Enduro, downhill, track racers – anyone can run the X4 confidently, it’s also light enough for cross country, cyclo-cross and road bikes.

Pair Thomson Elite X4 stems with our Elite or Masterpiece series posts, a seat post collar and handlebar for the entire cockpit collection.


Machined in our manufacturing facility in Macon, Georgia. The X4 is manufactured and tested to the same rigors as our aerospace parts, then ridden by the finest cyclists in the world – you!

  • Thomson CNC classic feed lines
  • Durable 3mm bolts and precision matching faceplate.
  • Precise steering and tracking for the ultimate control while riding
  • 40-60mm stems come in block style