The Load Range Letter on light truck tires indicates their ply rating.
|Load Range||Ply Rating|
The load index on passenger car tires and many light truck tires is a numerical code stipulating the maximum load (mass, or weight) each tire can carry.
Standard Load Table (extract from ETRTO Standards Manual – 2010 page G7 - ref 42 psi (290 kPa)
The speed symbol is made up of a single letter or an "A" and a number. It indicates the maximum speed at which the tire can carry a load corresponding to its Load Index.
Speed Ratings Chart
Plus 1 and Plus 2 Sizing
Plus Sizing is a concept designed to achieve enhanced vehicle performance over a base original equipment fitment. There are two main benefits for “inching up.” First, for many customers it is strictly cosmetic. A larger wheel simply looks better. Second, the wider section widths and lower profiles realized from the "Plus" concept yield a wider footprint that increases the vehicle’s steering response and overall cornering force. As the example in the chart indicates, increasing rim diameter, rim width and tire section width while decreasing aspect ratio gives the customer a higher level of handling with no change in gearing or speedometer accuracy.
In determining pro ...[more]
Tires are often not something we think about until we need to repair or replace them, but both as drivers and passengers our safety greatly depends on them. By investing a little time in learning about your tires, you will discover what you can do as a vehicle owner to prolong the life of your tires and enhance tire performance and safety. Though our Tires Basics section will not make you a tire expert, it will provide you with a basic tire overview and get you more familiar with your tires.
There is science behind today's tires, which combines concepts of physics with advances in engineering and chemistry. Innovative designs offer the ...[more]
There are numerous other markings on a typical tire, these may include:
- M+S, or M&S: Mud and Snow; A tire that meets the Rubber Manufacturers Association (RMA) and Rubber Association of Canada (RAC) all-season tire definition. These are all-weather tires, with self-cleaning tread and above-average traction in muddy or very light snowy conditions, and for low ambient temperatures. Spike tires have an additional letter, "E" (M+SE).
- Mountain Snowflake Pictograph: Winter passenger and light truck tires that meet the severe snow service requirements of Rubber Manufacturers Association (RMA) and Rubber Association of Canada (RAC).
Types of Tires – Tread Design
In choosing tires, it is important to consider factors such a quality brand and solid value, but it is also essential to select the right tires for your type of vehicle. It is also imperative that driving conditions be a major consideration in making a tire selection. Several types of tires are available to suit every kind of vehicle and all driving conditions.
- All-season tires are a widely used and most popular variety of tire, carrying "S" and "T" speed ratings. Sedans and minivans commonly have all-season tires as standard. All-season tires are developed to handle most conditions from dry pavement to wet weather and moderate snow. Characteristics of all-season tires include a comfortable and quiet ride, reliable handling, as well as ...[more]
Protecting your tire investment begins with proper maintenance. Well-maintained tires not only promote longer wear and tread-life, they substantially improve the safety of your vehicle.
- Tire Rotation – Tire rotation is essential in promoting even tread wear. Different types of rotational patterns will be more beneficial than others, depending on the type of vehicle and tread wear pattern. Tire rotation performed by automotive professionals will provide this service as well as the opportunity to detect other issues before they become serious problems.
- Tire Pressure – Correctly inflated tires assure even tread wear through equal weight distribution in the vehicle. Proper tire pressure is crucial for dependable handling, ...[more]
In the case of light truck tires...
As previously explained, most light truck tires follow the alpha-numeric tire code indicated by the letters LT at the beginning of the size code. However some light truck tires use a High Flotation code, indicated by the letters LT at the end instead of the tire size or simply omit the LT code completely as follows:
The tire diameter is given for High Flotation tires and omitted from Numeric tires.
- 2 digit number: The diameter of the tire in inches.
- x: Separator character.
Explanation of tire codes
Tire identification diagram
The alpha-numeric tire code consists of a string of letters and numbers, as follows:
An optional letter (or letters) indicating the intended use or vehicle class for the tire:
- P: Passenger Car
- LT: Light Truck
- ST: Special Trailer
- T: Temporary (restricted usage for "Space ...[more]
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