Dimension 31.8 Road Stems are fully forged 6061-T6 aluminum stems that have a 4-bolt handlebar clamp.Dimension stems are not intended for use with carbon handlebars or carbon steerer tubes31.8mm can be used with 26.0 bars with additional shim (SM5317)Item SpecificationsColorBlackIntended UseRoadBar Clamp Diameter31.8mmStem Angle107degStem Length120mmSteerer Tube1-1/8" ThreadlessDefined ColorBlackS.H.I.S. Clamp Diameter28.6