The Turbine stem is highly engineered to maximize stiffness & minimize weight and guarantee youre cockpit wont get overlooked. Featuring aerospace 7075 aluminum alloy, this stem is ideal for high level cross country racers but is strong enough for the all mountain rider. Machined to precision with 7075 aluminum for high strength & fatigue resistance at a very light weight. Interlocking 4 bolt bar clamp secures your bar and distributes loads away from bolts and into the body. RISE: + or - 6ø (reversible). SIZE: 60, 70, 90, 100 or 110mm. BAR DIAMETER: 31. 8mm. STACK HEIGHT: 39. 5mm. WEIGHT: 135g (90mm with 31. 8mm bar clamp).