Frequently Asked Questions
255 refers to the tire's tread width of 255 millimeters (around 10 inches wide). 50 is the aspect ratio, describing the sidewall height as 50% of the tread width. Lastly, 20 is the wheel diameter in inches.
While they share the same tread width, a 255/55R20 has a taller 55% aspect ratio sidewall compared to the 255/50R20's. It has a lower profile and a sportier 50% sidewall height. Moreover, the 50R20 provides you with sharper handling.