Even if you look at the spec tires for WGT it is not a cookie cutter approach. You have to make so many adjustments as far as how much to sauce or not sauce on the fronts, do you cut em to skins or no, glue the sidewalls or not. It isn't just take them out of the package, put them on and go run. 1/12th works the way it is, leave it that way. My 2 cents.