The Shimano SM-MA-F180S/P adapter allows the installation of Shimano IS2000-Standard caliper on forks with Postmount 160 mm direct style in conjunction with 180 mm rotors. Product features - Shimano SM-MA-F180S/P Fork type: Postmount 160mm (PM6) Caliper type: IS2000-Standard Rotor diameter: 180mm Material Adapter: Aluminium Screws: Steel