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How Are Tires Sized?

Tire sizes are made up of a collection of letters and numbers that all come together to create a multi-dimensional sizing.

It can be broken down to 4 important parts that represent the diameter of the wheel inside of the tire, the width of it and the profile.

A fourth factor that can be found when buying tires is the "speed rating" - this lets you know the top speed that the tire is designed to climb to.

Tires that are rated for high-speed use tend to be more expensive as they are made from different materials and have to go through tougher testing.

Tire pressures guide

Most Popular Tire Sizes

These are the most popular tire sizes that people come to OilType.co and search for. Click the links below the description to learn more about that particular size and see which models it fits.

Tire Icon 265/70R17

You will typically find the 265/70R17 size of tire mounted to SUVs and pickup trucks - such as the Toyota RAV4 and Cadillac Escalade. This 17-inch tire has a width of 265mm and a profile of 7cm from the wheel to the ground


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Tire Icon 225/45R18

The 225/45R18 size of tire can be usually found on compact and mid-size cars such as the BMW 3-Series and the Alfa Romeo Giulia. It has an overall width of 225mm along with a 4.5cm profile and it fits to an 18-inch wheel


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Tire Icon 235/75R15

This 235/75R15 tire size can be commonly found fitted to SUVs and compact pickup trucks like the Chevrolet Colorado and the 1990s Chevrolet Blazer. It has a width of 235mm along with a profile of 7.5cm and fits to 15-inch wheels


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Tire Icon 225/40R18

You can expect to find the 225/40R18 size of tires on sportier versions of small models of car such as the Audi A3 TDI Sport and the Acura ILX A-Spec. It fits and 18-inch wheel, is 225mm wide and has a low profile of just 4cm


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Tire Icon 225/45R17

225/45R17 is a common tire size for compact models of cars such as the Dodge Dart, Cadillac CT4 and the BMW Z4. It fits to a 17-inch wheel of 225mm width with a 4.5cm profile from the edge of the wheel to the ground


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Tire Icon 245/40R19

You can find the 245/40R19 size of tire fitted to full-size cars such as the BMW 5-Series and the Hyundai Sonata. It fits larger wheels of 19 inches in size with 245mm width and a smaller profile of just 4cm from the wheel to ground


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Tire Icon 245/75R16

The 245/75R16 size is a small but wide tire with a large profile making it ideal for small but heavy automobiles. You can expect to find this tire fitted to 16-inch wheels with a width of 245mm and a large profile of 7.5cm


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Tire Icon 195/65R15

The 195/65R15 size of tire is suited for a variety of different models of car, ranging from the 1990s VW Golf all the way to the modern Toyota Prius. It first wheels of 15 inches in diameter with 195mm width and a profile of 6.5cm


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Tire Icon 255/35R19

255/35R19 is a more exotic size of 19-inch tire that you can find fitted to a Lamborghini Aventador and several Audi models including the TT, A4 and A5. It has a wide width of 255mm and a small profile of just 3.5cm


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