Shimano F203P/P Disc Brake AdaptorLightweight, Stiff Aluminum ConstructionFor Post Mount forks with 160mm Post Mount to Post-Mount Calipers for use with 203mm RotorIncludes mounting bolts and hardwareBrake Caliper Mount: 74mm PostFor Rotor Diameter: Front 203 mmFrame/Fork Mount: 74mm, 160mm Post MountCaliper Type: 74mm Post MountRotor Size: 203 mm