ENVE Composites Aero Road Stem - 90 mm, 31.8 Clamp, -12,-17,-7, 1 1/8", Carbon, BlackAn 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. Product Details: Stem angle: 12degree fixed, 17degree 7degree with angle shim Specifications: Bar Clamp Diameter (mm): 31. 8 Color: