235 40r18 vs 235 45r18 Tire Size
There are a lot of different options to choose from. And if you’re like most drivers, you may not know the difference between a 235 40r18 and a 235 45r18 tire size.
Both sizes have their pros and cons, so it can be tough to decide which is the best option for you. In this article, we will compare the two sizes and help you decide which is the best choice for your needs.
235/40r18 vs 235/45r18 Table
This comparison table will help you see the main differences between the two sizes at a glance.
235/40r18 | 235/45r18 |
Overall Diameter 25.4 inches | Overall Diameter 26.33 inches |
Width 9.25 inches | Width 9.25 inches |
Sidewall Height 3.7 inches | Sidewall Height 4.16 inches |
Radial Tire (A Radial-Ply Tire) | Radial Tire (A Radial-Ply Tire) |
Rim Size 18 inches | Rim Size 18 inches |
Circumference 79.8 inches | Circumference 82.71 inches |
Revs Per Mile 793 | Revs Per Mile 766 |
Overall Diameter
The first thing to note is the difference in overall diameter. The 235 40r18 has a diameter of 25.4 inches, while the 235 45r18 has a diameter of 26.33 inches. This may not seem like a big difference, but it can make a big difference in the way your car handles.
The larger diameter 235 45r18 tire size will make your car feel more stable on the road and will provide better traction in wet or snow conditions. The difference between those tire sizes is 0.93 inches.
Section Width
The section width is the width of the tire from sidewall to sidewall. The 235 40r18 has a section width of 9.25 inches, while the 235 45r18 has a section width of 9.25 inches. They both have the same section width, so there is no difference in the way they will fit on your car.
Circumference
The circumference is the distance around the outside of the tire. The 235 40r18 has a circumference of 79.8 inches, while the 235 45r18 has a circumference of 82.71 inches. The difference in circumference is just over 2.91 inches or about 3.5%.
This can make a big difference in the way your car handles. A larger tire will make your car feel more stable on the road and provide better traction in wet or snow conditions.
Revolutions Per Mile
The number of revolutions per mile (RPM) is how many times the tire will go around in one mile. The 235 40r18 has an RPM of 793, while the 235 45r18 has an RPM of 766. The difference in RPM is just over 27 or about 3.6%. A higher RPM tire will make your car more responsive to steering input and provide better traction in dry conditions.
Sidewall Height
The sidewall height is the distance from the edge of the tire to the wheel. The 235 40r18 has a sidewall height of 3.7 inches, while the 235 45r18 has a sidewall height of 4.16 inches. A taller sidewall height will provide a smoother ride, but a shorter sidewall height will provide better handling.
Wheel Size
The wheel size is the diameter of the wheel that the tire will fit on. The 235 40r18 will do on an 18-inch wheel, while the 235 45r18 will work on an 18-inch wheel. They both have the same wheel size, so there is no difference in the way they will fit on your car.
Construction Type
The construction type is the way the tire is made. The 235 40r18 is a radial tire, while the 235 45r18 is a radial tire. Radial tires are made with steel belts that run around the circumference of the tire. The steel belts provide strength and durability, but they also make the tire more flexible.
Our Observation
Both tire sizes have their pros and cons, so it can be tough to decide which is the best option for you. If you are looking for a tire that will provide better traction in wet or snow conditions, the 235 45r18 is the best choice. If you are looking for a tire that will make your car feel more responsive to steering input and provide better traction in dry conditions, the 235 40r18 is the best choice.
If you are still unsure, we recommend contacting a local tire dealer or taking your car to a professional for an opinion. They will be able to help you decide which tire size is the best option for your vehicle. Thanks for reading! We hope this article was helpful.
