R18 tires are a plus sized option for LT265/60R20, LT275/65R20, LT285/60R20, and other tire sizes. If you drive a truck like the Nissan Titan XD, Ford F-350 Super Duty or RAM 2500 then 33×12. R18 is a plus sized option for you. A 33×12. R20 tire has an overall diameter of 33. It’s designed to fit on 20-inch diameter wheels with rim widths ranging from 8.The conversion to metric for 33/12. R15. The Key number is the 318 that is the width in mm. Also the calculation for the diameter of your tires are 33.
What are 33 inch tires good for?
A common misconception about 32″ Mud-Terrain tires is that they aren’t big enough for practical off-road use. Up-sizing tires on your truck or SUV isn’t required to achieve an aggressive look or to perform on the trails.