GMC Terrain: Wheels and Tires / Tire Designations

Tire Size

The following is an example of a typical passenger vehicle tire size.

GMC Terrain. Tire Designations

  1. Passenger (P-Metric) Tire : The United States version of a metric tire sizing system. The letter P as the first character in the tire size means a passenger vehicle tire engineered to standards set by the U.S. Tire and Rim Association.
  2. Tire Width : The three-digit number indicates the tire section width in millimeters from sidewall to sidewall.
  3. Aspect Ratio : A two-digit number that indicates the tire height-to-width measurements. For example, if the tire size aspect ratio is 60, as shown in item 3 of the illustration, it would mean that the tire's sidewall is 60 percent as high as it is wide.
  4. Construction Code : A letter code is used to indicate the type of ply construction in the tire. The letter R means radial ply construction; the letter D means diagonal or bias ply construction; and the letter B means belted-bias ply construction.
  5. Rim Diameter : Diameter of the wheel in inches.
  6. Service Description : These characters represent the load index and speed rating of the tire. The load index represents the load carrying capacity a tire is certified to carry. The speed rating is the maximum speed a tire is certified to carry a load.

    Tire Sidewall Labeling

    Useful information about a tire is molded into its sidewall. The examples show a typical passenger vehicle tire and a compact spare tire sidewall. Passenger (P-Metric) Tire Example Tire Size : The tire size is a combination of letters and numbers used to define a particular tire's width, height, aspect ratio, construction type, and service description...

    Tire Terminology and Definitions

    Air Pressure : The amount of air inside the tire pressing outward on each square inch of the tire. Air pressure is expressed in kPa (kilopascal) or psi (pounds per square inch)...

    Other information:

    GMC Terrain 2018-2021 Owners Manual: Lighting Conditions Affecting ACC


    The ACC front camera can be affected by poor lighting conditions, and ACC may have limited performance when: There are changes in brightness, such as entering and exiting tunnels, bridges, and overpasses. Low sun angles cause the camera to not detect objects, or it is more difficult to detect objects in the same traffic lane...

    GMC Terrain 2018-2021 Owners Manual: Head Restraints


    The vehicle’s front seats have adjustable head restraints in the outboard seating positions. Warning With head restraints that are not installed and adjusted properly, there is a greater chance that occupants will suffer a neck/spinal injury in a crash...

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      Vehicle Messages

      Messages displayed on the DIC indicate the status of the vehicle or some action that may be needed to correct a condition. Multiple messages may appear one after another.

      The messages that do not require immediate action can be acknowledged and cleared by pressing V. The messages that require immediate action cannot be cleared until that action is performed.

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