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Plus Sizing

Tires 101

Plus sizing wheels and tires is a popular trend among car enthusiasts. Adding inches to the wheel diameter for wider, low aspect ratio tires can increase your car’s performance capabilities including handling and stability. Some people will also plus size for the appearance; they may like the way a larger wheel and tire package fill up the wheel well of the car.

In simplest terms, plus sizing is when you increase the size of your tires and/or wheels from the original size put on the vehicle when manufactured (also known as the Original Equipment size, or OE). Once something done after the car was purchased, it is now common for auto dealerships to offer wheel and tire upgrades at the time of purchase.Plus Sizing Diagram

Plus Zero

If the wheel remains the same and only the width is increased it is called “Plus Zero.”

  • Increase the section width and lower the aspect ratio while retaining the wheel diameter.
  • This replacement tire increases the contact area and lowers the tread profile for improved traction and quicker response.

PLUS ONE

If the wheel size is increased by one inch it is “Plus One.” This sizing mounts tires with an increased section width and a lower aspect ratio on wheels of a larger diameter. A Plus One fitment for a car with 16-inch original equipment wheels would use 17-inch wheels. As a general rule of thumb, Plus One sizing:

  • Increases section width by 10 mm.
  • Decreases aspect ratio by 10 points.
  • Increases rim diameter by 1 inch.

PLUS TWO

If the wheel size is increased by two inches it is “Plus Two.”  For example, a plus two fitment for a car with 16-inch original equipment wheels and tires would be 18-inch wheels and tires. As a general rule of thumb, Plus Two Sizing:

  • Increases section width by 20 mm.
  • Decreases aspect ratio by 20 points.
  • Increases rim diameter by 2 inches.

PLUS THREE

If the wheel size is increased by three inches it is “Plus Three.” For example, a plus two fitment for a car with 16-inch original equipment wheels and tires would be 19-inch wheels and tires. As a general rule of thumb, Plus Three Sizing:

  • Increases section width by 30 mm.
  • Decreases aspect ratio by 30 points.
  • Increases rim diameter by 3 inches.

It is important to make sure you choose the right tires when plus sizing. Use the Find Tires tool to find plus sizing options for your vehicle and then work with a tire professional to find the right wheel and tire combination.