A tire's load index is a measurement of how much weight each tire is designed to support. The larger the number, the higher the load capacity. This is one of the most important numbers on your tire.
If a tire size has no letters at the beginning, this indicates a Euro metric tire. P-Metric and Euro-Metric tires may have different load capacities. The letters "LT," either at the beginning or at the end of the tire size indicate the tire was designed for light trucks.
Find the tire's speed rating. The speed rating indicates that the tire can carry a specified load up to a certain speed. The most common speed ratings are S, T, U, H, V, Z, W, Y, and (Y). S means a tire can travel 112 mph (180 km/h) for extended periods. T means a tire can travel 118 mph (190 km/h) for extended periods.
How to read metric sizes: P255/60R17 102V. The first letter in the tire size designates the tire class. An 'LT' would be a light truck class and no letter would be a euro-metric tire. Section Width : 255 The width of this tire size is 255mm wide. The first number in a metric tire size is the section width of the tire.
Read on to learn how to crack the tire code with this handy guide dedicated to tire types, sizes, and construction. Tire service type ratings Most tire sizes begin with one or more letters -- for example, P or LT.
Find the tire construction after the aspect ratio. This letter describes the tire's composition. “R” stands for radial construction, where the tire’s plies run at 90 degrees to the centerline of the tread. “D” stands for diagonal bias construction, where the plies are situated at angles lower than 90 degrees.
How to Read Tire Tread Depth. Tire tread depth refers to the grooves between the main blocks on the contact surface of a tire. Most tires start with upwards of 10/32″ of tread depth, with some off-road tires topping 15/32″ depth. As you rack up the miles, the soft rubber compound, the very thing that gives you traction, wears away.
How to Read Your Tire. Tire Ply Composition – The number of layers of rubber and fabric used in the tire. The more plies, the higher the load the tire can take. Also indicated are the materials used in the tire; steel, nylon, polyester, etc. Treadwear Grade – In theory, the higher the number here, the longer the tread should last.
How to Read a Tire Sidewall. Let us help you decode the sizing info, age, speed rating, and other important data that's on your tires.
The tire size branded on the sidewall provides a significant amount of information about the tire's intended purpose, dimensions, load capacity and high temperature/high speed durability. Our primary example will be based on variations of the 225/50R16 size, although other sizes will appear...