Tim.
I went back and researched this with tire calculators, and I think I am gonna stick to my post. The 235 (or whatever) is a metric width value. Does not matter what the rim size is. The 85 (for example) is a percentage that produces a metric height value. When I plug these values into several online calculators, they all say that with the "same" sized tire, a one-inch greater rim diameter increases the overall diameter by one inch. Is this wrong?
Harry
Last edited by harryr; 03/04/2013 7:19 PM.