Originally Posted by SShadow1974
Ok, I am confused. How can one go from a 285/75R17 to a 315/70R17 and gain a .8" in height? Isn't the 75 and 70 the sidewall of the tire? Wouldn't that mean a smaller tire diameter? *confused*
Yes the second number does tell you the sidewall height of the tire, but it's a ratio of the tread width, not a hard measurement number. Check out the Guide to Leveling & Wheel and Tire Sizing linked in my signature, it explains how to calculate the total height of a tire.