Get your self a pair of straight edges, wood strips, square or rectangular metal stock, what ever you have laying around the garage.
Cut them to length so they will lay across the flat portion of the "bead" of the wheel without touching the extreme rolled lip or the sidewall of the tire.
Set the wheel/tire assembly upright, have an assistant hold the straight edges across the beads of the wheel while you measure the inside distance between them with a tape measure.
Subtract 1/2 inch from that measurement. The result should approximate the width of your wheel.
cowboy from hell
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