Chevrolet Blazer 2023 Tire Designations User Guide
The example shows a typical passenger vehicle tire size
Passenger (P-Metric) Tire
- 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.
- Tire Width: The 3-digit number indicates the tire section width in millimeters from sidewall to sidewall.
- Aspect Ratio: A 2-digit number that indicates the tire height-to-width measurements. For example, if the tire size aspect ratio is 75, as shown in item (3) of the illustration, it would mean that the tire’s sidewall is 75 percent as high as it is wide.
- 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.
- Rim Diameter: The diameter of the heel in inches.
- 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 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).
Aspect Ratio: The relationship of a tire’s height to its width.
Belt: A rubber-coated layer of cords that is located between the plies and the tread. Cords may be made from steel or other reinforcing materials.
Bead: The tire bead contains steel wires wrapped by steel cords that hold the tire onto the rim.
Bias Ply Tire: A pneumatic tire in which Bias Ply Tire: A pneumatic tire in which the plies are laid at alternate angles less than 90 degrees to the centerline of the tread.
Cold Tire Pressure: The amount of air pressure in a tire, measured in kPa (kilopascal) or psi (pounds per square inch) before a tire has built up heat from driving. See Tire Pressure 0 283.
DOT Markings: A code molded into the sidewall of a tire signifying that the tire is in compliance with the U.S.
Department of Transportation (DOT)
Motor Vehicle Safety Standards. The DOT code includes the Tire Identification Number (TIN), an alphanumeric designator which can also identify the tire manufacturer, production plant, brand, and date of production.
GVWR : Gross Vehicle Weight Rating. See Vehicle Load Limits 0 188.
GAWR FRT : Gross Axle Weight Rating for the front axle. See Vehicle Load Limits 0 188.
GAWR RR : Gross Axle Weight Rating for the rear axle. See Vehicle Load Limits 0 188.
Intended Outboard Sidewall : The side of an asymmetrical tire, that must always face outward when mounted on a vehicle.
Kilopascal (kPa) : The metric unit for air pressure.
Light Truck (LT-Metric) Tire : A tire used on light duty trucks and some multipurpose passenger vehicles.
Load Index : An assigned number ranging from 1 to 279 that corresponds to the load carrying capacity of a tire.
Maximum Inflation Pressure : The maximum air pressure to which a cold tire can be inflated. The maximum air pressure is molded onto the sidewall.
Maximum Load Rating : The load rating for a tire at the maximum permissible inflation pressure for that tire.
Occupant Distribution : Designated seating positions.
Outward Facing Sidewall : The side of an asymmetrical tire that has a particular side that faces outward when mounted on a vehicle. The side of the tire that contains a whitewall, bears white lettering, or bears manufacturer, brand, and/or model name molding that is higher or deeper than the same moldings on the other sidewall of the tire.
Passenger (P-Metric) Tire : A tire used on passenger cars and some light duty trucks and multipurpose vehicles.
Radial Ply Tire : A pneumatic tire in which the ply cords that extend to the beads are laid at 90 degrees to the centerline of the tread.
Rim : A metal support for a tire and upon which the tire beads are seated.
Sidewall : The portion of a tire between the tread and the bead.
Speed Rating : An alphanumeric code assigned to a tire indicating the maximum speed at which a tire can operate.
Traction : The friction between the tire and the road surface. The amount of grip provided.
Tread : The portion of a tire that comes into contact with the road.
Treadwear Indicators : Narrow bands, sometimes called wear bars, that show across the tread of a tire when only 1.6 mm (1/16 in) of tread remains. See When It Is Time for New Tires 0 290.
UTQGS (Uniform Tire Quality Grading Standards) : A tire information system that provides consumers with ratings for a tire’s traction, temperature, and treadwear. Ratings are determined by tire manufacturers using government testing procedures. The ratings are molded into the sidewall of the tire.
See Uniform Tire Quality Grading 0 292.
Vehicle Capacity Weight : The number of designated seating positions multiplied by 68 kg (150 lbs) plus the rated cargo load. See Vehicle Load Limits 0 188.
Vehicle Maximum Load on the Tire :
Load on an individual tire due to curb weight, accessory weight, occupant weight, and cargo weight.
Vehicle Placard : A label permanently attached to a vehicle showing the vehicle’s capacity weight and the original equipment tire size and recommended inflation pressure. See “Tire and Loading Information Label” under Vehicle Load Limits 0 188.
Tires need the correct amount of air pressure to operate effectively.
Neither tire underinflation nor overinflation is good. Underinflated tires, or tires that do not have enough air, can result in:
- Tire overloading and overheating, which could lead to a blowout
- Premature or irregular wear
- Poor handling
- Reduced fuel economy for internal combustion engine vehicles
- Reduced range for electric vehicles
Overinflated tires, or tires that have too much air, can result in:
- Unusual wear
- Poor handling
- Rough ride
- Needless damage from road hazards
The Tire and Loading Information label on the vehicle indicates the original equipment tires and the correct cold tire inflation pressures. The recommended pressure is the minimum air pressure needed to support the vehicle’s maximum load-carrying capacity. See Vehicle Load Limits 0 188. How the vehicle is loaded affects vehicle handling and ride comfort. Never load the vehicle with more weight than it was designed to carry.
When to Check
Check the pressure of the tires once a month or more. Do not forget the spare, if the vehicle has one. The compact spare cold tire pressure should be at 420 kPa (60 psi). See Compact Spare Tire 0 301.
How to Check
Use a good-quality pocket-type gauge to check tire pressure. Proper tire inflation cannot be determined by looking at the tire. Check the tire inflation pressure when the tires are cold, meaning the vehicle has not been driven for at least three hours or no more than 1.6 km (1 mi).
Remove the valve cap from the tire valve stem. Press the tire gauge firmly onto the valve to get a pressure measurement. If the cold tire inflation pressure matches the recommended pressure on the Tire and Loading Information label, no further adjustment is necessary. If the inflation pressure is low, add air until the recommended pressure is reached. If the inflation pressure is high, press on the metal stem in the center of the tire valve to release air. Recheck the tire pressure with the tire gauge. Put the valve caps back on the valve stems to keep out dirt and moisture. Use only valve caps designed for the vehicle by GM. TPMS sensors could be damaged and would not be covered by the vehicle.
Chevrolet Blazer 2023 Top Accessories
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