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Tire Numbers: Understanding What They Mean

Tires are one of the most critical components of a vehicle, providing traction, stability, and safety on the road. Have you ever wondered what those little numbers on your tires mean? These codes carry important information about tire size, construction, speed rating, and more. In this blog post, we will unravel the meaning behind the numbers on tires to help you understand their significance.

Tire Size

The tire size is denoted by a series of numbers and letters. For example, if you see a code like "225/55R17," it contains the following information:

  • "225" represents the tire's width in millimeters, measuring from sidewall to sidewall.
  • "55" indicates the aspect ratio or profile of the tire, which is the percentage of the tire's height compared to its width.
  • "R" signifies that the tire has a radial construction and it can also be biased and belted-bias.
  • "17" denotes the diameter of the wheel in inches that the tire is designed to fit.

Load Index

The load index is a numerical code that indicates the maximum weight capacity of the tire. It ranges from 0 to 279 and correlates to a specific weight in pounds or kilograms. A load index of 90, for instance, can support a maximum load of 1,323 pounds per tire. The load index chart provides a reference for determining the weight capacity of different load index values.

Speed Rating

The speed rating symbol represents the maximum speed capability of the tire. It is denoted by a letter and ranges from "N" to "Y." Each letter corresponds to a specific speed range, as defined by the tire manufacturer. For example, a tire with a speed rating of "H" can handle speeds up to 130 mph (210 km/h). It is essential to match the speed rating of your tires with your vehicle's recommended speed rating to ensure safe and optimal performance.

Tread Wear Rating

The tread wear rating is a three-digit number that indicates the tire's expected lifespan in terms of wear. A higher tread wear rating suggests that the tire is designed to last longer. For example, a tire with a tread wear rating of 500 is expected to wear longer than one with a rating of 300. It's important to note that the tread wear rating is a relative measure, and actual mileage may vary based on driving habits and conditions.

Tire Services At Golden Gear Automotive!

If you are looking for tire services in Sebastopol, CA, or the surrounding area, Golden Gear Automotive is a shop you can trust! You can call us at (707) 827-9245 or book an appointment through our website today!

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