285 65r18 vs 285 70r18 Tire Size
Bigger tires provide you with improved control and steadiness, in addition to greater amounts of traction. Of course, increased weight and reduced speed due to the extra surface area are potential drawbacks; that said, these larger sizes can also be cost-effective if done correctly.
285/65r18 vs 285/70r18 Table
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What Does 285 70r18 Tire Mean?
The 285 70r18 tire size is a metric tire. The first number, 285, refers to the width of the tire in millimeters. The second number, 70, refers to the sidewall height as a percentage of the width. The last number, 18, is the diameter of the wheel in inches. The Letter “r” following the numbers means that the tire is a radial tire.
Tire Diameter
You can find how tall your tire is in the tire diameter section. For example, a 285 70r18 tire has an overall diameter of 33.71 inches, and the diameter of the 285 65r18 tire size is around 32.59 inches.
A taller tire will have a higher rolling resistance, which means it will take more energy to get the tire moving. A shorter tire will have a lower rolling resistance, which means it will take less energy to get the tire moving.
Section Width
The section width of a tire is the width of the tire from sidewall to sidewall in millimeters. For example, the 285 70r18 tire size has a section width of 285 mm, and the section width of a 285 65r18 tire size is also 285 mm. Both are the Same.
The wider the tire, the more contact it will have with the ground. This gives you more traction and stability but can also lead to increased wear and tear on the tire.
Circumference
The circumference of a tire is the distance around the outside of the tire. For example, the 285 70r18 tire size has a circumference of 105.9 inches, and the 285 65r18 tire size has a circumference of 102.37 inches. The difference between those is 3.53 inches or 3.3%.
A tire with a larger circumference will cover more ground per revolution than a tire with a smaller circumference. This can be helpful if you are frequently driving on long, straight roads.
Revolutions Per Mile
The number of revolutions per mile (RPM) is a measure of how far the tire will travel in one mile. For example, the 285 70r18 tire size has an RPM of 598, and the 285 65r18 tire size has an RPM of 618.
The difference between those is 20 revolutions per mile, or about 3.4%. The higher the RPM, the shorter the distance the tire will travel in one mile. The lower the RPM, the longer the distance the tire will travel in one mile.
Sidewall Height
The sidewall height of a tire is the distance from the edge of the rim to the top of the tread in millimeters. For example, the 285 70r18 tire size has a sidewall height of 199.5 mm, and the 285 65r18 tire size has a sidewall height of 185.25 mm.
The sidewall height is essential because it affects the tire’s ability to absorb shocks and bumps. A taller sidewall will provide more cushioning, while a shorter sidewall will provide less cushioning.
Wheel Size
The wheel size is the diameter of the wheel in inches. For example, the 285 70r18 tire size has a wheel size of 18 inches, and the 285 65r18 tire size has a wheel size of 18 inches. The wheel size is important because it affects the height of the tire.
Construction Type
Radial tires are the most common type of tire. They are constructed with the ply cords running radially across the tread from one sidewall to the other. The benefits of radial tires include better fuel economy, longer tread life, and a smoother ride. Both 285 65r18 and 285 70r18 tire sizes is a radial tires.
Our Observation
The main difference between 285 65r18 and 285 70r18 tire size is in the sidewall height. The 285 70r18 tire size is 0.56 inches or 7.1% taller than the 285 65r18 tire size. The height difference can affect the tire’s ability to absorb shocks and bumps and the tire’s rolling resistance.
If you are looking for a smoother ride and longer tread life, the 285 70r18 tire size may be a better choice. However, the 285 65r18 tire size may be a better choice if you are looking for better fuel economy.
Conclusion
Both tire sizes have their own benefits, so choose the one that best suits your needs. If you frequently drive on long, straight roads, a tire with a larger circumference (such as the 285 70r18 tire size) may be a better choice.
If you are looking for better fuel economy, a tire with a smaller circumference (such as the 285 65r18 tire size) may be a better choice. Thank you for reading! We hope this article was helpful. If you have any questions or comments, please feel free to leave them below. We would love to hear from you!
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Meet Caitlin McCormack, a Tire Size Expert and Blogger Passionate About Everything Related to Tires. With Years of Experience in the Tire Industry, Caitlin Has Become an Expert in Tire Sizes and Their Impact on Vehicle Performance.
