Oversize Front Radial Brake Caliper Bracket Shim for 13" Rotors lets you upgrade your stock axial calipers to radial style, perfectly accommodating oversize 12.5" or 13" front rotors. Made to fit both left and right sides, it’s designed for Nissin and Tokico radial mount calipers. Not compatible with spoked wheel or narrow glide front ends, this daring upgrade pushes your braking performance to the next level.