Compare 285/70R17 vs 315/70R17

Let's break down what happens when you switch from your original 285/70R17 tires to the new 315/70R17 setup. The new tire has a total diameter of 34.4 inches. This means it is 5.1% taller than your factory tire. Knowing this size difference is the first step to making sure your new tires won't rub against the car's body when you go over bumps.

A quick heads-up: car experts usually recommend keeping the size difference under 3%, and your new choice goes a bit past that limit. Because the new tires are quite different in size, your car might feel a bit slower to accelerate, and it could confuse your anti-lock brakes (ABS). You might also need to raise your car a little bit or trim the fenders so the tires fit safely.

Because the new tires are a different size, they will spin at a slightly different speed. When your dashboard says you are driving 60 mph, you will actually be going 63.0 mph. Also, when you are cruising on the highway, your engine will run about 5% lower (less RPM) than it used to. It's a good idea to keep this in mind so you don't accidentally get a speeding ticket!

Now, let's talk about how the car will look. Your new setup pushes the wheels out by 15.0 mm, bringing them right in line with the edge of the fenders. Car enthusiasts call this a "Flush" fitment, and it is known for giving cars a very sleek, sporty, and custom appearance.

Finally, looking at how the tire fits on the wheel: your tire is a bit wider than the wheel, giving it a "Meaty" or bulging look. Off-roaders and drag racers love this setup because the extra rubber acts like a cushion, making the ride more comfortable and protecting your wheels from potholes.