195/45R15 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:
| 195 | The tire width is 195mm. |
| 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. |
| 15 | Rim diameter for the tire. 195/45R15 tire can be mounted only to a 15″ rims. |
Best selling 195/45R15 tires
Toyo Tires EXTENSA HPII All-Season Radial Tire - 195/45R15 78V
(as of December 11, 2023 18:26 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Set of 2 (TWO) Haida Racing HD921 Summer Performance Radial Tires-195/45R15 195/45/15 195/45-15 78V Load Range SL 4-Ply BSW Black Side Wall
(as of December 11, 2023 18:26 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Set of 4 (FOUR) Haida Racing HD921 Summer Passenger Car Performance Radial Tires-195/45R15 195/45/15 195/45-15 78V Load Range SL 4-Ply BSW Black Side Wall UTQG 420AA
(as of December 11, 2023 18:26 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
What is 195/45R15 tire size in inches?
Because the width of 195/45R15 tire is stated in millimeters and sidewall height in percentages, you have to make calculations to see what the true size of 195/45R15 is in inches. Luckily, we have made these calculations for you.In this table you can see size of 195/45R15 in inches, as well as few additional metrics:
| In inches | In millimeters | |
| Section Width | 7.7″ | 195mm |
| Sidewall height | 3.5″ | 88mm |
| Diameter / Height | 21.9″ | 557mm |
| Circumference | 68.8″ | 1748mm |
| Rim Diameter | 15″ | |
| Revolutions | 921 per mile | 572 per kilometer |
Recommended Rim Sizes for 195/45R15 Tires
For 195/45R15 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 195/45R15 to a too wide or too narrow rim. Here are the recommended rim sizes for 195/45R15 tire:
| Diameter | Width Range |
| 15″ | 6-7.5″ |
195/45R15 – Variations
When you look at the tire code on 195/45R15 tires, you may see there are additional numbers and letters after the code 195/45R15. These numbers and letters refer to speed rating and load index of the tire. 195/45R15 has at least following variations available on the markets:
195/45R15 78V