Depends on if you use it off-road. Mine came stock with 31x10.5 tires on 15x8 rims, but mine was the "rene" package. Those tires should fit, but may rub if you're flexing off-road. It also will affect gearing, but not much. Mine came with stock 3.73 gears with the 4.0 5speed, lower gears than the normal YJ.