285 75r17 vs 285 70r17 Tire Size
When it comes time to replace your tires, the first question you have to ask is what size do you need? There are a few different sizes to choose from, but two of the most popular are 285 75r17 and 285 70r17. So, which one should you choose?
285 75r17 vs 285 70r17 Table
This table will compare the two sizes and help you decide which one is better for you.
285 75r17 | 285 70r17 |
 |  |
Diameter 33.83 inches | Diameter 32.71 inches |
Width 11.22 inches | Width 11.22 inche |
Sidewall Height 8.42 inches | Sidewall Height 7.85 inches |
Radial Tire (A Radial-Ply Tire) | Radial Tire (A Radial-Ply Tire) |
Rim Size 17 inches | Rim Size 17 inches |
Circumference 106.28 inches | Circumference 102.76 inches |
Revs Per Mile 596 | Revs Per Mile 616 |
Aspect Ratio 75% Of Its Width | Aspect Ratio 70% Of Its Width |
What Does 285 70r17 Tire Mean?
The numbers and letters in a tire size refer to the tire’s width, height, and diameter. The first number, 285, refers to the tire’s width in millimeters. The second number, 70, is the aspect ratio. This is the height of the sidewall expressed as a percentage of the width.
In this case, the sidewall is 70% as tall as the width of the tire. The last number, 17, is the diameter of the wheel in inches. Last but not least letter R indicates the tire construction type. In this case, R means radial tire.
Tire Width
Tire width is measured in millimeters and refers to the distance between the tire’s sidewalls. The wider the tire, the more contact it has with the road. This results in better traction but can also lead to a rougher ride.
The main difference between 285 75r17 and 285 70r17 Tire is that 285 75r17 has a wider width that is excellent for off-roading. While 285 70r17 has a narrower width better for on-road driving. The width of the 285 75r17 tires is 285 mm. The width of the 265 70r17 tires is 265 mm. That means that the 285 75r17 tires are 20 mm wider than the 265 70r17 tires.
Aspect Ratio
As we mentioned before, the aspect ratio is the height of the sidewall expressed as a percentage of the width. In other words, it is the sidewall height divided by the tire width. The aspect ratio of 285 75r17 tires is 75% which is 213.75 millimeters.
The aspect ratio of 285 70r17 tires is 70% which is 199.5 millimeters. That means that the sidewall of the 285 75r17 tires is about 13 millimeters taller than the sidewall of the 285 70r17 tires.
Construction Type
The last letter in tire size indicates the construction type of the tire. In this case, both tires are radial tires, indicated by the letter R. Radial tires are the most common type of tire and offer a few advantages over other types of tires.
Radial tires have steel belts that run across the tread at an angle. This gives the tire strength and durability while also providing a smooth ride. Radial tires also have better heat dissipation which leads to a longer lifespan.
Rim Size
The last number in tire size indicates the rim size in inches. This is the diameter of the wheel that the tire will be mounted on. In this case, both tires are 17 inches. Most passenger vehicles come with 16 or 17-inch wheels. Larger trucks and SUVs may have 18 or 20-inch wheels.
Circumference
This is important because it determines how far the tire will travel in one revolution. A larger circumference means that the tire will travel further in one circle.
The circumference of 285 75r17 tires is about 106.28 inches, while the circumference of 285 70r17 tires is about 102.76 inches. That means that the 285 75r17 tires will travel about one inch further than the 285 70r17 tires in one revolution.
Revolutions Per Mile
This number tells you how many times the tire will go around one mile. The higher the number, the fewer times the tire will go around in one mile. The revolutions per mile of 285 75r17 tires are about 596.
While the revolutions per mile of 285 70r17 tires are about 616, that means that the 285 75r17 tires will go around about 20 times less in one mile than the 285 70r17 tires.
Our observation
We can see from the above information that the 285 75r17 tires are more comprehensive and have a taller sidewall than the 285 70r17 tires. The 285 75r17 tires will also travel further in one revolution than the 285 70r17 tires.
The main advantage of 285 75r17 tires over 285 70r17 tires is that they are better for off-roading. The taller sidewall’s wider width gives the 285 75r17 tires more grip on loose surfaces. The 285 75r17 tires will also absorb more shock from bumps and other obstacles.
The main advantage of 285 70r17 tires over 285 75r17 tires is that they are better for on-road driving. The narrower width and shorter sidewall make the 285 70r17 tires more stable on the pavement. The 285 70r17 tires will also provide a smoother ride on smooth surfaces. If you’re planning to do a lot of off-roading, then 285 75r17 tires are the way to go. If you’re primarily going to be driving on the pavement, then 285 70r17 tires are the better choice.
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