The new Super Zero Seatpost with 25mm setback with carbon monocock construction is extremely lightweight. 1-bolt clamp system for easy and fast assembly Fine-tuning of the saddle tilt angle is possible through the adjustment screw on the seat post head. Fits oval carbon rails Material: UD Full Carbon Seatpost Length: 13.8 inches (350 mm), Diameter: 1.1 inches (27.2 mm), 1.2 inches (31.6 mm), Setback: 1.0 inches (25 mm), Weight: 7.5 oz (215 g) (31.6 mm) *Compatible with oval rails up to 7 x 9.5 mm) *Compatible with Deda battery