High technology seat post. Main shaft in cabon fiber, CNC machined parts. Exclusive and patented nut retention system, that makes seat assembly much easier. Setback: 23 mm Diameter: Ø 27,2 - Ø 31,6 - Ø 32,4 mm Length: 290 mm (11 1/2); (320 mm -12 1/2 in.) Weight: 199 grams (6 7/8 oz.); offset 28 mm Tightening torque M8 bolt 22 Nm