Size and Service


Size Designation and Service Description

There are many factors that contribute to how your vehicle performs, but few have as direct an impact as its tires. It’s vital to have a good understanding of your tires’ capabilities, and more importantly, their limitations. A tire’s weight and speed limits are indicated by the tire service description; a short code located on the sidewall. This short code, which consists of a two- or three-digit number along with a single letter, designates just how much weight your tires are capable of carrying safely (load index) and the maximum speed the tires are designed for (speed category).