For Demanding Downhill riders the Thomson Elite X4 Stubby MTB Stem now comes in compact super strong DH sizes – 50mm and 60mm with 0 degree rise. Utilising the obvious benefits of machining from a solid piece of aluminium billet this oversize stem is undoubtedly the benchmark in stiffness and strength. Shaped to save weight with cut away steerer and with 4 bolt face plate. 1 1/8 inch steerer diameter. 31.8mm handlebar clamp.