225/40r18 vs 245/40r18 Tire Size

There are a few different things to consider when making this decision. The type of vehicle, the driving conditions, and personal preferences will all play a role in what size tire is right for you. We will compare the 225 40r18 and 245 40r18 tire sizes and help you decide which one is best for your car!

225 40r18 vs 245 40r18 Table

This table chart will help you to understand the differences between the 225 40r18 and 245 40r18 tire sizes.

225/40r18

245/40r18

Overall Diameter 25.09 inches

Overall Diameter 25.72 inches

Width 8.86 inches 

Width 9.65 inches

Sidewall Height 3.54 inches 

Sidewall Height 3.86 inches 

Radial Tire (A Radial-Ply Tire)

Radial Tire (A Radial-Ply Tire)

Rim Size 18 inches

Rim Size 18 inches

Circumference 78.81 inches

Circumference 80.79 inches

Revs Per Mile 803

Revs Per Mile 784

Overall Diameter
The overall diameter is the first thing to look at when comparing two tires. The 245 40r18 has a diameter of 25.72 inches, while the 225 40r18 has a diameter of 25.09 inches. This means that the 245 40r18 is slightly larger than the 225 40r18.

The larger diameter of the 245 40r18 can have some advantages. It can provide a smoother ride, as well as better handling. The larger size can also help to improve traction, especially in wet or icy conditions.

Section Width
The section width is the second number in the tire size. This is the measurement of the tire width from sidewall to sidewall. The 245 40r18 has a section width of 9.65 inches, while the 225 40r18 has a section width of 8.86 inches.

The wider section width of the 245 40r18 can provide some benefits. It can improve handling and stability, especially at high speeds. However, the wider width can also make the tire more susceptible to damage from road debris.

Circumference
The circumference is the measurement of the distance around the tire. The 245 40r18 has a circumference of 80.79 inches, while the 225 40r18 has a circumference of 78.81 inches. This means that the 245 40r18 is slightly larger than the 225 40r18. The larger circumference of the 245 40r18 can provide some benefits.

Revolutions Per Mile
The revolutions per mile (RPM) is the number of times the tire will go around in a mile. The 245 40r18 has an RPM of 803, while the 225 40r18 has an RPM of 784. This means the 245 40r18 will go around slightly more in a mile than the 225 40r18. It can improve fuel economy and provide a smoother ride.

Sidewall Height
The sidewall height is the third number in the tire size. This measures the sidewall height from the wheel to the top of the tread. The 245 40r18 has a sidewall height of 3.54 inches, while the 225 40r18 has a sidewall height of 3.86 inches. The sidewall height difference is 0.31 inches or 8.9%.

Wheel Size
Rim size is the diameter of the wheel that the tire is mounted on. The 245 40r18 can be mounted on an 18-inch wheel, while the 225 40r18 can also be mounted on an 18-inch wheel. That means both tire sizes can be mounted in the same size wheel.

Construction Type
The construction type is the fourth number in the tire size. This number will be either an “R” or a “B.” The “R” stands for radial construction, while the “B” stands for bias-ply construction. Radial tires are the most common type of tire and are typically used on passenger vehicles.

Bias-ply tires are less common and typically used on commercial vehicles. The 245 40r18 has radial construction, while the 225 40r18 also has radial construction. That means both tire sizes are radial tires.

Suitable Vehicle
Both 225/40R18 and 245/40R18 are used in both common and sporty vehicles. The 225/40R18 tire size is a popular choice for coupes and sedans, such as the Mini Cooper Clubman, Acura ILX, BMW M240i, Hyundai Veloster, Kia Forte, Toyota Corolla, and Volkswagen GTI.

On the other hand, there are a few everyday cars that use the 245/40R18 tire size, like the Honda Accord and older Subaru Forester models. This size is also used on the Mercedes-Benz E-Class, Chevrolet Corvette, BMW 5 Series, and Audi A4.

Our Observation
The decision of which tire size to choose can be a difficult one. If you are looking for a better tire in the snow, the 225 40r18 might be a good choice. It offers slightly better traction than the 245 40r18.

If you are looking for a tire that is better in dry conditions, the 245 40r18 is probably the better choice. It offers better handling and stability, as well as a smoother ride. It is also slightly more fuel-efficient than the 225 40r18.

Conclusion
The main difference between 225 40r18 and 245 40r18 tire sizes is in the section width. That means the 245 40r18 tire size is 0.79 inches or .9% wider than the 225 40r18 size.

Ultimately, it depends on your personal preferences and driving habits. I hope this article helps you understand the difference and decide which size is right for you. If you have any questions or comments, please feel free to leave them below.

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