View Here : Numbers On Tires
The second number is the width of the tread. The width from each side of the section of tread is 7 inches. The last number is the wheel diameter. My front wheel is 10 inches in diameter.
The numbers represent the aspect ratio. lets use 235/60 15 as an example. the 235 means the tire is 235mm wide. the 60 means the tire is 60 percent as wide as it is tall and t … he 15 is the size wheel the tire will fit. If you have 235/75 15 the tire is still 235 mm wide but the sidewall is taller at 75 % of 235.