The Thomson Masterpiece Set-back Seatpost features a 41mm seat rail grip length.All surfaces machined to remove weightAccommodates seat tube angles of 62 degrees or more41mm seat rail grip lengthItem SpecificationsColorBlackWeight199gLength350mmMaterial7000 AluminumSeatpost Diameter31.6mmOffset16mmMinimum Height100mmMax Height285mmSeatpost TypeRigidClamp StyleStd RailsDefined ColorBlack