The Shimano SM-MA-F203P/S adapter allows the installation of Shimano Postmount caliper on forks with IS2000-Standard 160 mm direct style in conjunction with 203 mm rotors. Product features - Shimano SM-MA-F203P/S Fork type: IS2000-Standard (160mm) Caliper type: Postmount Rotor diameter: 203mm Material Adapter: Aluminium Screws: Steel