Elite 31.8 X4 StemDescription Machined in Thomson's manufacturing facility in Macon, Georgia. The X4 is manufactured and tested to the same rigours as our aerospace parts, then ridden by the finest cyclists in the world you! The X4 starts life as a one piece 7000 series extruded billet precision solid block of aluminum. Thomson's vision of the perfect stem, the X4 is the purist combination of strength, weight and CNC precision. Enduro, downhill, track racers anyone can
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