245/45R17 Tires & Tire Size

245/45R17 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:

245 The tire width is 245mm.
45 The aspect ratio of the tire is 45. 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.
17 Rim diameter for the tire. 245/45R17 tire can be mounted only to a 17″ rims.

Best selling 245/45R17 tires

What is 245/45R17 tire size in inches?

Because the width of 245/45R17 tire is stated in millimeters and sidewall height in percentages, you have to make calculations to see what the true size of 245/45R17 is in inches. Luckily, we have made these calculations for you.In this table you can see size of 245/45R17 in inches, as well as few additional metrics:

  In inches In millimeters
Section Width 9.6″ 245mm
Sidewall height 4.3″ 110mm
Diameter / Height 25.7″ 652mm
Circumference 80.7″ 2049mm
Rim Diameter  17″  
Revolutions  785 per mile  488 per kilometer

Recommended Rim Sizes for 245/45R17 Tires

For 245/45R17 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 245/45R17 to a too wide or too narrow rim. Here are the recommended rim sizes for 245/45R17 tire:

Diameter Width Range
17″ 7.5-9″

245/45R17 – Variations

When you look at the tire code on 245/45R17 tires, you may see there are additional numbers and letters after the code 245/45R17. These numbers and letters refer to speed rating and load index of the tire. 245/45R17 has at least following variations available on the markets:

245/45R17 95H 245/45R17 95T 245/45R17 95V 245/45R17 95W 245/45R17 95Y 245/45R17 99H 245/45R17 99T 245/45R17 99V 245/45R17 99W 245/45R17 99Y