[FH212]

Originally Posted by colberjs

285 is the section width (width of the tire in millimeters). The height of the tire is going to depend on the aspect ratio, which is the second number in a tire size. For instance 285/70-17 is going to be 285mm (11.2") wide and the sidewall height is going to be 70% of that, or 200 mm (7.85"), with a 17" rim giving you an overall diameter of 32.71 inches.

Here is a link to a tire calculator to help you make your decision.

Tire Dimensions Made Simple - Discount Tire

Thanks! That will help.