Build in a D-Shaped design for optimized aerodynamics and compliance. With three post lengths and two setback offsets, there is a post for all frame sizes and riding positions. Please note, the Aero Seatpost is built specifically for ENVE Melee & Fray frames. Developed in CFD and the wind tunnel, the Melee & Fray have features such as the d-shaped seatpost and refined tube shapes that have been tuned to complement our own SES(TM) rim shapes and deliver aerodynamic performance that is Real-World Fast(TM). Available in three seatpost sizes with two seatback options - 275mm, 350mm, and 400mm seatpost lengths in either 0mmm or 20mm offset. Specifications: - Material: Carbon Fiber - Hardware Material: Titanium - Lengths: 275mm, 350mm, 400mm - Diameter: D-Shaped - Offset: 0mm, 20mm - Saddle Angle Adjustment: 0-27 degrees - Saddle Rail Compatibility: 7x9mm Carbon Rails, 7mm Round Alloy Rails - Torque Spec: Saddle Rail Clamp Bolts 5.5Nm - Torque Spec: Seatpost Collar 6Nm for the ENVE Fray / Melee frames