On my 32 Highboy I run Michelin xzx 145 SR15s on 15x4 1/2 American Racing magnesium 12 spoke spindle mounts on the front. On the rear I have Hoosier ProStreet Radial 31-16.50-R16 on 16X13 Magnesium Halibrand Sprints. It drives and handles great. I run 35 lbs psi in the front and 12-15 psi in the rear.