Thanks for posting the info.
The way I have always determined actual diameter of the "weighted" tire on the vehicle is to place a 24" level on the top center of the tire, level the bubble and then measure straight down to the floor to get the diameter. Of course you want the tire correctly inflated and loaded as you would be driving it.(full tank of gas, etc).
That would be the actual diameter the rear ring/pinion turns on the road. The number on the sidewall would be inaccurate if plugged into tire formulas.
The 35" tall(sidewall number)Goodyear tires I run on my 4x4 are 33.5" tall when mounted and installed. Thats what my axle really turns.
