ENVE Composites Aero Road Stem - 90 mm 31.8 Clamp -12-17-7 1 1/8" Carbon BLKENVE Composites Aero Road Stem 90 mm 31. 8 Clamp 12 17 7 1 1 8" Carbon Black. An aerodynamically honed stem with adjustable length and angle to optimize your position. Linking handlebar to fork the stem was developed for the refined ride response and control needed in a critical area of the bike. This stem is intended for negative drop only and cannot be flipped or reversed in a positive rise. Stem angle: 12degree fixed 17degree 7degree with angle