The Shimano SM-MA-R160P/S adapter allows the installation of Shimano Postmount caliper on frames with IS2000-Standard 140 mm direct style in conjunction with 160 mm rotors. Product features - Shimano SM-MA-R160P/S Frame type: IS2000-Standard (140mm) Caliper type: Postmount Rotor diameter: 160mm Material Adapter: Aluminium Screws: Steel