Vision Metron Seatpost – 27.2 x 350mm 0mm Offset Carbon. A good seatpost is essential for consistent power delivery against the clock. The Metron post delivers with carbon fiber monocoque construction that combines the shaft and head into a single strong yet lightweight piece. The post is topped off with a forged alloy Minimal Top Clamp for secure saddle location. Simple two-bolt adjustment allows fine control of your saddle angle so its easy to get your ideal riding position.