I want to get a set of Weld draglites for my truck. As everyone know the largest size they come in is 15". I want to go 15 x 8 in the front and 15 x 10 in the rear. Does anyone know what off set I would need for these sizes. I know there is a wheel offset calculator but I store my truck in a different state and cannot do the measurements at this time. Any help is greatly appreciated !