Shimano Post Mount Brake Adapter - OE Packaged This Shimano Post Mount Brake Adapter is a crucial component for proper caliper spacing on a post mount disc brake equipped frame or fork, allowing riders to run their preferred rotor size where they want. The lightweight, durable construction and precise fit allow riders to rely on this simple, but often overlooked brake system component. Features No packaging this item comes shipped without Shimano-branded packaging Frame compatibility with IS-type disc brake mounts Lightweight, durable construction designed for long-term reliability | Shimano | Post Mount Brake Adapters - Oe Packaged 180Mm Post To 203Mm Rotor (Sm-Ma-F203P/pm)