30.8mm

Reliable Material: Crafted from high-strength aluminum alloy, this seat post shim adapter ensures a rigid and secure connection between your frame and seat tube. It is more durable and reliable than plastic alternatives, providing superior resistance to compression and deformation for long-lasting performance and enhanced riding safety. Relevant Usage: This bicycle seat post is the perfect solution for installing a 27.2 mm diameter seat post into a bicycle frame designed for a 30.8 mm seat post. The seat post is suitable for upgrading, repairing, or customizing various bikes, including mountain bikes and road bikes, allowing you to use your preferred seat post without changing the frame. Easy-to-Use: Installation is a quick and simple process. Just insert the seat post shim adapter into your bike's 30.