315/70r17 vs 305/70r17 Tire Size
Tire size is one of the lesser-known but extremely important considerations when buying a new car. It may sound like an unimportant detail, but your tire size can significantly impact your car’s performance, safety, and fuel efficiency.
This is why it’s essential to know what size tires you should put on your new car for the best performance and value. This article will tell you everything you need to know about comparing 315 70r17 and 305 70r17 tire sizes and how they affect performance and cost.
315 70r17 vs 305 70r17 Table
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What Does 315 70r17 tire Mean?
The 315 70r17 tire size is a metric sizing typically used on trucks and SUVs. The first number in the 315 70r17 tire size, 315, refers to the tire’s width in millimeters.
The second number, 70, refers to the height of the tire sidewall as a percentage of the width. The third number, 17, is the diameter of the wheel in inches. The letter R at the end of the 315 70r17 tire size indicates that the tire is a radial tire.
What Does 305 70r17 tire Mean?
The 305 70r17 tire size is similar to the 315 70r17 tire size. The only difference is in the width of the tire. The 305 70r17 tire size has a width of 305 millimeters.
As with the 315 70r17 tire size, the second number, 70, refers to the height of the sidewall, and the third number is the diameter of the wheel. The letter R at the end indicates that this is a radial tire.
Tire Diameter
One of the most important aspects of tire sizing is the diameter. The diameter is important because it needs to be compatible with your vehicle’s wheel size. If the tire is too large or too small, it will not fit on your vehicle.
The 315 70r17 tire size has a diameter of 34.36 inches. The 305 70r17 tire size has a diameter of 33.81 inches as well. The difference in the diameter is 0.55 inches or 1.6%. However, it is essential to note that the tires’ width and height will also affect the diameter.
Section Width
The section width of a tire is the width from one sidewall to the other. The 315 70r17 has a section width of 12.40 inches. The 305 70r17 has a section width of 12.01 inches. That is a difference of 0.39 inches or 3.2%.
The section width is important because it affects the overall width of the tire. A wider tire will provide more stability and grip. A narrower tire will be lighter and provide less rolling resistance.
Circumference
The circumference of a tire is the distance around the outside of the tire. The 315 70r17 has a circumference of 107.95 inches. The 305 70r17 has a circumference of 106.22 inches. That is a difference in circumference of is 1.73 inches or 1.6%
The circumference is important because it affects the gear ratio of your vehicle. A larger circumference tire will cause your vehicle to have a higher gear ratio. The engine will have to work harder to turn the larger tires.
Revolutions Per Mile
The revolutions per mile are important because it affects your vehicle’s fuel economy. A tire with a higher RPM will cause your vehicle to have a lower fuel economy. The 315 70r17 has an RPM of 586. The 305 70r17 has an RPM of 596. That is a difference of 10 RPM or 1.6%.
Sidewall Height
The sidewall height of a tire is the distance from the edge of the wheel to the top of the tire. The 315 70r17 has a sidewall height of 8.68 inches. The 305 70r17 has a sidewall height of 8.41 inches. That is a difference of 0.28 inches or 3.2%.
The sidewall height is essential because it affects the clearance of your vehicle. A taller tire will have a higher clearance, which is important for off-road driving. A shorter tire will have a lower clearance and be better for on-road driving.
Wheel Size
Rim size is essential because it needs to be compatible with your vehicle. If the rim is too large or too small, it will not fit on your vehicle. The 315 70r17 has a rim size of 17 inches. The 305 70r17 has a rim size of 17 inches. Both of these tire sizes have the same rim size.
Construction Type
Radial tires are the most common type of tire. The 315 70r17 is a radial tire. The 305 70r17 is also a radial tire. Both of these tire sizes have the same construction type.
Our Observation
The 315 70r17 and the 305 70r17 have very similar dimensions. The only significant difference is in the width of the tire. The 315 70r17 is slightly wider than the 305 70r17. However, both tire sizes have the same diameter, sidewall height, and wheel size. The only difference is in the circumference and the revolutions per mile.
Conclusion
If you are looking for a slightly wider tire than the 305 70r17, then the 315 70r17 is a good option. However, if you are looking for a tire with the exact dimensions, the 315 70r17 or the 305 70r17 will work. I hope this article was helpful. If you have any questions, please feel free to leave a comment below. Thanks for reading!
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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.
