315/40R26 Tires & Tire Size

315/40R26 refers to the size of the tire. It’s a standard which is used by car and tire manufacturers. By having the standard, tire manufacturers are able to manufacture same size tires independently and users can buy same size tires from different manufacturers.

Here’s an explanation of what these metrics mean in practice:

315 The tire width is 315mm.
40 The aspect ratio of the tire is 40. Aspect ratio refers to the height of tire sidewall in relation to tire width in percentages.
R The letter in the middle refers to tire construction. Practically all tires sold for cars are radials.
Sometimes you also see tires with RF or ZR. RF indicates the tire is run flat, whereas ZR means the tire has speed rating higher than V. These tires are also radials, as the R indicates.
26 Rim diameter for the tire. 315/40R26 tire can be mounted only to a 26″ rims.

Best selling 315/40R26 tires

What is 315/40R26 tire size in inches?

Because the width of 315/40R26 tire is stated in millimeters and sidewall height in percentages, you have to make calculations to see what the true size of 315/40R26 is in inches. Luckily, we have made these calculations for you.In this table you can see size of 315/40R26 in inches, as well as few additional metrics:

  In inches In millimeters
Section Width 12.4″ 315mm
Sidewall height 5.0″ 126mm
Diameter / Height 35.9″ 912mm
Circumference 112.8″ 2866mm
Rim Diameter  26″  
Revolutions  561 per mile  349 per kilometer

Recommended Rim Sizes for 315/40R26 Tires

For 315/40R26 tires you need to have correct size rims to install the tires to. There are different width rims available in the market, and you can run into problems by installing 315/40R26 to a too wide or too narrow rim. Here are the recommended rim sizes for 315/40R26 tire:

Diameter Width Range
26″ 10.5-12.5″

315/40R26 – Variations

When you look at the tire code on 315/40R26 tires, you may see there are additional numbers and letters after the code 315/40R26. These numbers and letters refer to speed rating and load index of the tire. 315/40R26 has at least following variations available on the markets:

315/40R26 120V