The contact slr aero handlebar series represents giant39s total commitment to system engineered performance stiff light and fine tuned to reduce vibration it dramatically improves aerodynamic performance so you can ride faster with less effortfeatures material ultra light carbon composite steerer clamp size 318mm 1 14quotsizes400mm x 90mm 100mm 420mm x 100mm 110mm 440mm x 110mm 120mm