Easton EC70 Zero 400mm Carbon Seatpost. The Easton EC70 Zero carbon fiber seatpost is fully optimized for performance. The EC70 Zero utilizes the same overall monocoque carbon construction as the top end EC90, but with an aluminum upper clamp. This low profile, micro adjusting clamp allows easy adjustment and optimal saddle clearance. By incorporating RAD Relief Area Design and TaperWall technology, the EC70 Zero has been designed to distribute stress along the length of the post. Easton has also removed material in critical clamp zones to prevent pinching the carbon which can sacrifice durability.