Overall wheel size is often indicated by the rim diameter as a shorthand for what size tire your vehicle needs. Load index is a shorthand way of describing the total weight that the tire can handle when it is fully inflated. The higher the load index rating, the more weight the tire can carry.
You need a tire load index rating chart to see how your load index rating correlates to the weight the tire can carry. For example, a load index of 81 means that the tire can carry up to 1, pounds. Load index ratings for the average vehicle range from , but some tires can range all the way up to , which equates to 7, pounds. Like load index, speed rating is another shorthand way to reference how fast the tire is designed to go.
It is indicated by a letter that corresponds to the maximum speed of the tire. Now that you know what each element of tire size means, we can walk through an example of how to read a tire size off of a sidewall. Our service experts will check your brake fluid for free and replace it with high-quality fluid if necessary. Great news! Roll by Goodyear is available in your area. Write a Review.
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How to Read a Tire Size. What's On Your Tire's Sidewall? With a little explanation it's easy to understand what all of the letters and numbers mean on your tire's sidewall.
The numbers are indicators of the size, type, and performance of the tire. Enter your information to see the tires that fit your vehicle. Tire Type The letter "P" at the beginning of the "Tire Size" tells us the tire is a P-Metric tire, referring to tires made to certain standards within the United States, intended for Passenger vehicles.
Tire Width Is the width of the tire measured in millimeters from sidewall to sidewall. The first three-digit number in the tire size refers to the tire width. How Cars are Stolen. Search Results. How Tire Sizes Work Comments. Section Width. Aspect Ratio. Load Index. Speed Rating. Facebook Twitter Pinterest. Written by: Tom Appel on April 13, P-metric and Euro-metric in the all season and summer categories. Quality grading is designed to make the tire purchase decision easier for you.
Ideally, the system is intended to provide simple, comparative data so you can make an intelligent buying decision. However, the ratings are based upon test results achieved under special conditions. You should still rely on your service or tire professional for assistance. Quality grading designates the comparative performance levels of a tire based on government-specified tests but commissioned by the individual tire manufacturers.
All tire manufacturers are required to grade regular and all-season passenger tires in three categories:. Treadwear The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course for 6, miles 9, km. For example, a tire graded would wear one and a half times as well on the government course as a tire graded However actual tire performance depends on driving habits, road characteristics, service practices, and other factors that can influence the outcome.
They represent how well tires stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. C-rated tires will have the lowest traction performance. Temperature Grades A, B and C The temperature grades A, B, and C represent the tire's resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel.
Grades A and B represent higher levels of performance on the laboratory test wheel than the minimum required by law. DOT Quality Grades All passenger car tires must conform to other federal requirements in addition to these grades.
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