Tallest tire fitment on rear of Scamp

Just threw that size into the calculator and its showing 28" tall and 10" wide. I dont have the offset hangers so I would have to stick with the narrower tire.
different tires have different section widths , I just bought a pair of Nitto 275/60/15s for my car and they have a section width of 11" according to vendor , hoosier makes a 28x9.5 in a street compound and I'm sure if you look hard enough you can find something close to that .