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 18 inch steerer diameter 318mm handlebar clamp