Dimension 31.8 Stems are fully forged 6061-T6 aluminum stems that have a 4-bolt handlebar clamp. 31.8mm can be used with 26.0 bars with additional shim (SM5317) Dimension stems are not intended for use with carbon handlebars or carbon steerer tubes Bar Clamp Diameter (mm): 31.8 Color: Black Defined Color: Black Length: 110 Material: Alloy S.H.I.S. Stem Clamp Diameter: 28.6 Stack Height: 41 Stem Angle (deg): 35 Weight: 177