Shimano F180p/p2Disc Brake Adaptor Shimano Disc Brake Adaptors are the finest disc brake adaptors available for Shimano disc brakes. Utilizing an extremely stiff aluminum construction, you will achieve your proper brake alignment and optimum function. This adaptor is for mounting a standard Post Mount caliper to a Post Mount fork to use a 180mm disc brake rotor. Use all Shimano brake components for the best braking performance. Please note: thisadaptor is designed for the 160mmnativepost mount standard. Some newer forks are 180mm native and do not require this adaptor to use a 180mm rotor. Please check your fork before ordering. Lightweight, Stiff Aluminum Construction For Post Mount forks with 160mm Post Mountto Post-Mount Calipers for use with180mm Rotor Includes mounting bolts and hardware Brake Caliper Mount: 74mm Post For Rotor Diameter: Front 180 mm Frame/Fork Mount: 74mm, 160mm Post Mount Caliper Type: 74mm Post Mount Rotor Size: 180 mm | Shimano | F180P/p2 Disc Brake Adaptor 180Mm Rotor, 74Mm Caliper, 74Mm Fork