Here are a few measurements you will need before you buy wheels for your rod.
In addition to the above measurements, it is recommended that you check the clearance on your existing wheels. Areas to check are:
Remember, always make sure the wheels are load rated to your vehicle. Check the GAWR (Gross Axle Weight Rating) of the heaviest axle of your vehicle. The wheel load rating is based on 50% of the heaviest GAWR of your vehicle.