305 70r17 vs 285 75r17 Tire Size

You may be wondering what the difference is between a 305 70r17 and a 285 75r17. Both of these sizes are popular options for light trucks and SUVs, but which one should you choose for your vehicle? In this blog post, we will discuss the pros and cons of each size so that you can make an informed decision about which one is right for you.

305/70r17 vs 285/75r17 Table

285 75r17

305 70r17

Diameter 33.83 inches

Diameter 33.81 inches

Width 11.22 inches 

Width 12.01 inche 

Sidewall Height 8.42 inches 

Sidewall Height 8.41 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 106.22 inches

Revs Per Mile 596

Revs Per Mile 596

Aspect Ratio 75% Of Its Width

Aspect Ratio 70% Of Its Width

What Does 285 75r17 Tire Mean?

The 285 in a 285 75r17 tire size refers to the width of the tire in millimeters. The width is measured from sidewall to sidewall. The 75 is the aspect ratio, which is the height of the tire’s sidewall expressed as a percentage of the width.

In this case, the sidewall is 75% as tall as the width of the tire. The r in 285 75r17 stands for radial construction, and the 17 is the tire’s diameter in inches.

Tire Width

The first thing you’ll notice when comparing a 305 70r17 to a 285 75r17 is that the 305 is a wider tire. The width difference may not seem like much, but it can make a big difference in the way your vehicle handles. The 285 75r17 tires are 285mm wide, while the 305 70r17 tires are 305mm wide. This difference in width can have a few different effects on your vehicle.

Wider tires provide more stability and grip, which is why they are often used on trucks and SUVs. They also tend to wear down more quickly than narrower tires. On the other hand, wider tires can make your vehicle harder to handle on winding roads and adverse weather conditions.

Aspect Ratio

The second thing to notice when comparing these two tire sizes is the difference in aspect ratio. The 285 75r17 has a taller sidewall than the 305 70r17. This height difference can affect the way your vehicle handles and rides. The Aspect Ratio of 285 75r17 Tire is 75% which is 213.75 mm, and the Aspect Ratio of 305 70r17 Tire is 70% which is 213.5 mm.

Taller tires provide a smoother ride, but They are also more susceptible to damage from potholes and other road hazards. Shorter tires provide better handling and are less likely to be damaged by road debris, but they can provide a rougher ride.

Construction Type

R indicates that the tire has radial construction. This is the most common type of tire construction and is used on most passenger vehicles. Both 305 70r17 and 285 75r17 is radial type.

Radial tires are characterized by their plies, or layers of tire cord, that run perpendicular to the direction of travel. This construction provides a more durable tire that can withstand higher speeds and heavier loads.

Rim Size

The last thing to note when comparing these two tire sizes is the difference in rim size. The 17 in 285 75r17 and 305 70r17 indicate the diameter of the tire’s rim in inches. The 285 75r17 has a 17-inch rim, while the 305 70r17 has a 17-inch rim.

Larger rims provide better handling and a smoother ride, but they can also be more susceptible to damage. Smaller rims are less likely to be damaged, but they can provide a rougher ride.


The circumference of the 285 75r17 is 106.28 inches and the circumference of the 305 70r17 is 106.22 inches. In this comparison, they don’t have much difference in circumference. The circumference of a tire is the distance around the outside of the tire.

This measurement is crucial because it determines how far the tire will travel in one revolution. In one revolution, a larger circumference tire will travel a greater distance than a smaller circumference tire.

Revolutions Per Mile

The difference in circumference between the 285 75r17 and 305 70r17 is 0.06 inches. This difference will result in a slightly different revolution per mile. The 285 75r17 will have 370.43 revolutions per mile, and the 305 70r17 will have 370.64 revolutions per mile.

The revolutions per mile, or RPM, is a measure of how fast the tire is moving. A higher RPM means that the tire is moving faster. The difference in RPM between the 285 75r17 and 305 70r17 is not significant.

Our Observation

The main difference between the two tires is the width. The 305 70r17 is a wider tire than the 285 75r17. This width difference can have a few different effects on your vehicle. If you are looking for a tire that provides more stability and grip, the 305 70r17 is a good choice.

However, consider that wider tires tend to wear down more quickly than narrower tires. If you are looking for a tire that is less likely to be damaged by road debris, the 285 75r17 is good. However, keep in mind that taller tires can provide a rougher ride.

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