The Shimano SM-MA90-F203P/PM Mount Adapter allows you to install a 203 mm disc brake rotor on a frame or fork originally designed for a 180 mm mount. It provides an easy solution for riders seeking stronger braking performance on steep or demanding trails.

Post Mount Design for Secure Fit: This adapter is compatible with Post Mount calipers and Post Mount fork or frame configurations. It ensures proper alignment and stability when increasing rotor size, delivering reliable and consistent braking control.

Corrosion-Resistant Hardware: Included washers are surface-treated in silver to prevent rust, even in wet or humid riding conditions. A wire clip is also provided to securely fix the bolts, enhancing overall safety during aggressive riding.

Versatile Usage and Compatibility: While originally designed for Shimano BR-M985 and BR-M988 brakes, the adapter is compatible with all Shimano 74 mm caliper models, making it a versatile upgrade across a wide range of setups.

To use a 203 mm rotor on a fork with a 160 mm mount, a different adapter (SM-MA-F203P/PA) is required. Always verify frame and fork specifications to ensure correct installation.