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This is the width of an inflated tire in millimeters at its widest point from sidewall to sidewall.The section height of the tire is measured in millimeters also.For example, a tire graded 200 would wear twice as well on the course as a tire graded 100. It is important to note that the true performance of a tire depends upon the actual conditions of its use.Actual conditions may depart significantly from the test conditions due to variations in driving habits, service practices and differences in road characteristics and climates.

Load Index Chart Speed Symbol Chart Speed ratings are determined by indoor laboratory testing methods, which measure high-speed tire durability under controlled test conditions.This diagram will help you to understand those numbers and letters.For assistance in selecting a replacement tire, always consult your Toyo Tires dealer.A number, followed by two to three letters, identifies the grade on the sidewall.Treadwear Rating: The treadwear grade is a comparative numerical rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course.

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