Question: what is the difference between a 65 and a 70 tire?
Answer: What Is the Difference Between a 65 & 70 Series Tire? The series number in a tire-numbering system refers to the aspect ratio of the tire's sidewall height to its width. A series 65 tire's height is 65 percent of its width, a series 70 tire's height is 70 percent of its width and so on.