Light and stiff in 31.8mm. Sportscar performence for the price of a Volkswagen. For road and MTB use. 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: A light weight stem in 31,8, which is still totally bombproof and stiff as! Also suitable for aero bars. Titanium screw option. Six extremely hard titanium screws, specially produced by Syntace will lighten your F 149 stem by 13 grams and will not corrode even in salt water. Special 200 head makes the best bed for your handlebar, by reducing bar flex. Youll get increased handlebar strength and fatigue life without any extra weight. VR 3 The Red Monster tested by the worlds toughest test standard for handlebars and stems. Period.