3B,
Thank you! This helps a lot. I do have a couple, probably dumb and certainly uninformed, questions. First, are the wheel sizes you cite the original equipment options? Second, I think that the wheel width measurement is supposed to be taken between the inside of rims, so it would be overestimated by my outside measurements. My measurement of 6 1/4 inch for the old wheels seems too small for even the smaller 9.00x20 wheel, but I only measured this once need to check it. But the 8 1/4 inch measurement for the newer wheels was done several times, and seems much larger than the bigger, available 7.0 inch wheel. Could this mean that the 9.00x20 tires are not supposed to be used on these wider wheels?
JRMunn
