If you've ever wondered what all those alphanumeric codes on the sidewall of a tire meant, this article will describe them in detail and arm you with the facts to make an informed decision when purchasing tires.
When it comes to buying new tires for your vehicle, the array of alphanumeric codes on the sidewall can seem like a foreign language. However, these codes are packed with valuable information that can help you make an informed decision. This guide will break down these codes and provide you with the knowledge to choose the right tires for your needs.
Let's start with a typical tire size marking: P215/65R15 89H. Here's what each part of this code means:
P: Indicates the tire is for a passenger vehicle. Other designations include:
215: The width of the tire in millimeters from sidewall to sidewall. A wider tire offers more grip but can reduce fuel economy, increase noise, and perform poorly in wet conditions.
65: The aspect ratio, which is the ratio of the tire's height to its width. A higher number means a taller sidewall, which provides a quieter ride but can cause howling in turns. Lower numbers are better for handling, making them ideal for sports cars.
R: Indicates a radial tire, constructed with layers of fabric with cords running radially across the tire. Other types include:
15: The diameter of the wheel (or rim) in inches.
89: The load index, which indicates the maximum weight the tire can carry. For example:
H: The speed rating, which indicates the maximum speed the tire can safely maintain. Common speed ratings include:
The Uniform Tire Quality Grading (UTQG) system, mandated by the Federal Government, provides ratings for treadwear, traction, and temperature resistance. These ratings are usually found opposite the tire size markings.
Treadwear: The standard grade is 100. A grade of 200 means the tread would last twice as long as a tire graded 100.
Traction: Grades range from AA to C, with AA being the highest. A C grade indicates poor braking performance on wet surfaces.
Temperature: Grades are A (best), B, and C (meets minimum safety standards). Factors like heavy loads, under-inflation, and high speeds can affect tire temperature.
The Department of Transportation (DOT) code indicates that the tire complies with DOT safety standards. This code also includes an identification or serial number that designates where and when the tire was produced.
Other important information found on the tire sidewall includes:
Tires carry a wealth of information that can help you make an informed decision. By understanding the codes on the sidewall, you can choose the right tires for your vehicle, ensuring safety and performance.
For more detailed information, you can refer to the NHTSA and RMA websites.
This article has been crafted to provide a comprehensive understanding of tire sidewall codes, helping you make informed decisions when purchasing new tires.
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