I got the aspect ratio using this size converter http://www.redrock4x4.com/tire...ButtonName=Calculate.
Glad you like the Sportsman S/R's. These are good for the rears but I think I'll need something different for the front (just as I had stated earlier). The Mickey Thompsons size 26X10.00R15LT ends up being metric size of 254/55/15.
That's too wide for me for fronts and the sidewall looks too tall. You can see this in the below photo. I think the rears look great but the sidewalls on the front look too tall:
Trying to match the S/R's tread pattern, I've found these: