305 70r16 vs 315 75r16 Tire Size

If you’re in the market for a new set of tires, But not sure which to pick, Then you come to the right place. Both of these sizes are popular options, but they have different benefits and drawbacks. This blog post will compare and contrast these two sizes to help you make the best decision for your needs.

305/70r16 vs 315/75r16 Table

305 70r16

315 75r16

Diameter 32.81 inches

Diameter 34.6 inches

Width 12.01 inches 

Width 12.4 inche 

Sidewall Height 8.41 inches 

Sidewall Height 9.3 inches 

Radial Tire (A Radial-Ply Tire)

Radial Tire (A Radial-Ply Tire)

Rim Size 16 inches

Rim Size 16 inches

Circumference 103.08 inches

Circumference 108.71 inches

Revs Per Mile 614

Revs Per Mile 582

Aspect Ratio 70% Of Its Width

Aspect Ratio 75% Of Its Width

What Does 305 70r16 Tire Mean?

The number and the letter in a tire’s size designation tell you the tire’s width in millimeters and inches, respectively. The “R” stands for radial construction, and the 16 is the diameter of the wheel in inches. So, a 305 70r16 tire has a width of 12.01 inches or 305 millimeters and a diameter of 16 inches.

Tire Width

Another significant  difference between 305 70r16 and 315 75r16 Tire is in the width. You’ll notice that the 305 70r16 tire is slightly wider than the 315 75r16. This may not seem like a big difference, but it can have a pretty significant impact on your driving experience. The width of a 305 70r16 tire is 305 millimeters or 12.01 inches, while the 315 75r16 tire is 315 millimeters or 12.40 inches. That’s a difference of just over three-tenths of an inch.

Aspect Ratio

The second number in a tire size designation is the aspect ratio. This tells you the height of the sidewall as a percentage of the width. So, a 70 aspect ratio means that the sidewall is 70% as tall as the tire is wide. In other words, the sidewall of a 305 70r16 tire is 12.01 inches wide by 21.42 inches tall, while the sidewall of a 315 75r16 tire is 12.40 inches wide by 23.20 inches tall.

The taller sidewall of the 315 75r16 tires gives it a slightly larger contact patch with the ground. This can provide better traction, especially in off-road driving conditions. It also provides the tire with a softer ride since there’s more cushioning between the road and the wheel.

Construction Type

The “R” in a tire size designation stands for radial construction. This is the most common type of construction, and it offers several benefits. Radial tires have a ply cord that runs perpendicular to the direction of travel.

This gives the tire added strength and durability. It also helps to dissipate heat, which is essential for preventing tire failure. The 305 70r16 and 315 75r16 tires have radial construction, which offers several benefits.

Rim Size

The final number in a tire size designation is the diameter of the wheel. This is also expressed in inches. So, a 16-inch diameter wheel is the most common size for both the 305 70r16 and 315 75r16 tires. This is the standard size for many vehicles, so you shouldn’t have any trouble finding wheels to fit these tires.


The circumference of a tire is the distance around the outside of the tire. This is important to know because it determines how far the tire will travel in one revolution. The circumference of a 305 70r16 tire is 103.08 inches, while the circumference of a 315 75r16 tire is 108.71 inches.

Revolutions Per Mile

The number of revolutions per mile (RPM) is a way of expressing the circumference of a tire. This is important to know because it can affect your fuel economy. The higher the RPM, the more fuel you’ll use.

The RPM of a 305 70r16 tire is 614.67, while the RPM of a 315 75r16 tire is 582.85. This means that the 305 70r16 tires will travel slightly farther than the 315 75r16 tires in one mile.


Now that you know more about the 305 70r16 and 315 75r16 tires, you can make a decision about which size is right for you. Both of these sizes have their advantages and disadvantages. If you are looking for a tire with a wider width, then the 315 75r16 is the better choice.

If you want a taller sidewall for a softer ride and more traction, then the 305 70r16 is the better choice. Ultimately, the decision comes down to personal preference. Both of these sizes are popular choices for many drivers.

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