305/40R22 Tires & Tire Size

305/40R22 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:

305 The tire width is 305mm.
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.
22 Rim diameter for the tire. 305/40R22 tire can be mounted only to a 22″ rims.

Best selling 305/40R22 tires

What is 305/40R22 tire size in inches?

Because the width of 305/40R22 tire is stated in millimeters and sidewall height in percentages, you have to make calculations to see what the true size of 305/40R22 is in inches. Luckily, we have made these calculations for you.In this table you can see size of 305/40R22 in inches, as well as few additional metrics:

  In inches In millimeters
Section Width 12.0″ 305mm
Sidewall height 4.8″ 122mm
Diameter / Height 31.6″ 803mm
Circumference 99.3″ 2522mm
Rim Diameter  22″  
Revolutions  638 per mile  396 per kilometer

Recommended Rim Sizes for 305/40R22 Tires

For 305/40R22 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 305/40R22 to a too wide or too narrow rim. Here are the recommended rim sizes for 305/40R22 tire:

Diameter Width Range
22″ 10-12″

305/40R22 – Variations

When you look at the tire code on 305/40R22 tires, you may see there are additional numbers and letters after the code 305/40R22. These numbers and letters refer to speed rating and load index of the tire. 305/40R22 has at least following variations available on the markets:

305/40R22 114H 305/40R22 114S 305/40R22 114T 305/40R22 114V 305/40R22 114W