Made for round 1 1/8 inch steerer tubes, the Contact AeroLight is a lightweight stem that offers easy-to-adjust integrated cable routing for drop or flat bar bikes. Features: Made for round 1 1/8 inch steerer tubes. 31.8mm round clamp fits drop and flat handlebars. Integrated aero design unifies the top cap, cables and spacers with the head tube for improved aerodynamics. Premium alloy design delivers maximum stiffness and light weight. Easy cable management guides cables under the handlebar and into the side and underside of the stem for optimized aerodynamics and a clean look. -10deg angle.