Thomson's X4 mountain stem is a benchmark in performance. Designed and machined to aerospace standards in Georgia, USA, this may very well be the last stem you ever buy. In the 60mm and shorter lengths its design changes to a block-style stem for maximum strength and stiffness.
Machined 7000-series extruded bar stock with new steerer clamp assembly
Custom heat-treated bolts with corrosion-preventative plating
31.8mm bar clamp with smooth edges for carbon bars
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