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Knowing what size tire a 315 70r17 is ensures you purchase the perfect tire for your vehicle.
315 is the section width of the tire measured in millimeters, meaning it has a section width of 12.4 inches.
The sidewall height percentage of a 315 70r17 tire is 70, and the tire height is 34.362, making it near-equivalent to a 35" model.
We'll cover everything from rim diameter to tire revolutions to the overall diameter of the 315 tire in the sections below.
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The 315 in this tire size is a metric measurement representing only the tire width in millimeters.
It doesn't denote the tire tread, outer diameter, wheel rim, inner sidewall, or other measurements.
Usually, you'll see the "315 70r17" tire, which denotes various metrics, as per the following:
The 315 70r17 tire has a width of 12.4 inches.
To replace a 315 70r17 tire, you must be within three percent of the overall diameter of the original tire.
Therefore, you can replace this tire with any of the following 14 compatible tire sizes:
The height of the 315 70r17 tire is 34.362 inches, calculated using the following formula:
You can see the formula in action in the next section.
A 35" tire size is a metric measurement referring to the aspect ratio multiplied by the tire width.
The calculation gives you the sidewall height.
After that, multiply it by two because there are two sidewalls per tire, then divide by the wheel inch and add the wheel size.
In formula form, the 35" tire size looks like this:
Understanding the differences between imperial and metric is a good idea when it comes to tire size.
Since there are so many tire sizes on the market, knowing the disparities can be the difference between finding the perfect fit for your vehicle and not.
A 315 70r17 tire is equivalent to 34.4x12.4R17 inches.
It has a section width of 12.4 inches (i.e., the measurement from the inner sidewall to the outer sidewall) and a rim diameter of 17 inches, representing the wheel size it can be mounted on.
The measurement from the wheel rim to the tire tread, otherwise known as the sidewall height, is 8.7 inches, and it boasts an overall diameter of 34.4 inches, reflecting the outer diameter of the tire.
The outer perimeter or circumference is 108 inches, meaning it performs 587 tire revolutions per mile.
Despite what you may think at first glance, a 315 70r17 tire is the same as a 35-inch tire — 315 dictates the tread width of the tire, and 35" is the tire diameter.
Naturally, the confusion exists due to the difference in reference names.
But it isn't too tricky to understand once you realize there is no difference in the tires themselves; 315/70/17 is simply the metric equivalent size for 35-inch imperial tires.
The 315 70r17 tire has a section width of 12.4 inches, a height of 34.362 inches, and an aspect ratio of 70%.
The overall diameter of the tire is 34.4 inches, so the tire revolves 587 times per mile or 364 times per kilometer.
While you can use certain tire size tools to check the measurements of the 315 70r17 tire, knowing it off the top of your head helps when shopping for that all-important perfect fit.
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