The Trekk Seat Collar by Axiom is a clever solution for adding a rear rack to almost any bike frame lacking dedicated eyelets. This lightweight adapter replaces your existing seatpost collar, instantly providing two M5 threaded mounting eyelets to secure a bicycle rack. It's particularly well-suited for bikes with alloy or steel seatposts.Designed to minimize stress on both the frame and seatpost, this forged aluminum collar creates a robust connection point, transforming your bike into a capable cargo hauler. Whether you're commuting, touring, or just need extra carrying capacity, the Trekk Seat Collar makes rack installation straightforward and secure.## Features* Replaces stock seatpost collar to add rack mounting points.* Creates two M5 threaded eyelets for upper rack attachment.* Clamp design minimizes stress on seatposts and frames.* Ideally suited for bicycles with alloy or steel seatposts.* Forged aluminum construction for durability.## Specs* Material: Forged aluminum* Dimensions: 5.1 x 2.5 x 0.3 cm* Weight: 144 g (0.32 lb)* Compatibility: Most bikes with seat tube diameter of 28.6 mm, 29.8 mm, 31.8 mm, or 34.9 mm