If 31.8 mm is being used for the handlebar clamping diameter then the rest of the stem should be made equally as stiff and strong. A thicker stem tube is used and this oversize diameter is kept throughout the stem to the clamp area. Unmatched combination of new, high-strength and forgeable aluminium alloy and real 3D forging. The result: The lightest stem in 31,8, which is still totally bombproof and as stiff as other stems that weight 160 g. Also suitable for aero bars. Light weight Titanium bolts - standard This light weight stem is factory equipped with high quality Syntace titanium bolts to save even the last gram. Special 200° head makes the best “bed” for your handlebar, by reducing bar flex. You’ll get increased handlebar strength and fatigue life, at minimal weight. VR-3 “The Red Monster” tested by the world’s toughest test standard for handlebars and stems.