robert flippo said

i worked for Firestone for years as a manager, when you are talking tire sizes 205,215,225 and so on has nothing to do with width, this is how tall the sidewalls are,and that determines height, if you are wanting width , that is the 70,60,55 and so on, and the last number is size for rim, 13,14,15. so if you want a wider tire for back go to 60 or 55s, i run 50s on back of a 74 duster, but you have to watch what type of wheel you use about spring rub or fender rub

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