Ritchey Seatpost RL1 OffsetProduct Details Proven 2 bolt design provides a class leading balance between strength, weight and easy adjustability. Low profile clamp reduces stress on lightweight rails and wont bottom out. Product Technical Details Material: 6061 alloy 2 pieces construction Diameter: 27. 2, 30. 9, 31. 6mm Total length: 400mm (including 100mm of minimum insert) Offset: 25mm Saddle clamp: standard Saddle clamp torque: 13Nm (max) Seat collar torque: not specified