• Forged aluminum • Integrated micro-adjust seat clamp

Trek-compatible seat mast cap Offered in white and black and a variety of lengths and offsets, the mast cap includes hardware compatible with round saddle rails only. 7x10mm carbon rail-compatible hardware sold separately. Key features: - Ultra-light carbon construction - One bolt head design offers easy fore-aft and infinite angle adjustment - Compatible with all Trek road bikes with round seat masts - 175mm and 135mm lengths - 5mm and 20mm offsets - Aluminum clamp

Light, high-tech and comfortable, Specialized's S-Works Carbon Seatpost will improve your ride. It's built of Specialized's FACT carbon for a feathery weight and impressive strength and durability. Plus, the post features a cylindrical head assembly that's simple to adjust fore/aft and tilt with a single bolt. The S-Works seatpost comes in a 400mm length with zero or 20mm setback, as well as a 350mm length with 20mm setback.