One of the best ways to achieve a higher level of performance and enhance the appearance of your vehicle is through Plus Sizing.
This method improves handling capabilities by mounting tires that are wider and have a shorter sidewall on a larger diameter custom wheel.
The Theory is that while making these changes you keep the overall tire diameter within 3% of the original equipment wheel and tire.
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Improvements by Plus Sizing
Plus Sizing will increase your vehicle's stability by improving steering response, handling and cornering capability. The result is a larger contact patch and a sportier look. By using a larger diameter wheel with a lower profile tire it's possible to properly maintain the overall original diameter of your wheel and tire.
Problems by over Plus Sizing
As mentioned above it's important to keep your new custom wheels and rims within 3% of the original equipment wheels and tires. Differences larger than 3% can cause problems with transmission shift points which can decrease fuel mileage. It can also confuse braking system computers. Other problems include a big losses in ride comfort, possible hydroplaning and snow traction.
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The most popular methods of Plus Sizing
One method of Plus Sizing is to keep the same wheel and tire diameter as your originals but increase the width. This requires the replacement of your wheel with a larger rim width. Plus replacing the original equipment tire with one that is the same width as the rim. This method is called "Plus Zero" and will provide a good balance between performance and ride quality.
Using a one inch larger diameter wheel in conjunction with a one inch narrow tire height at the width you want. This method is called "Plus One".
Using a two inch larger diameter wheel in conjunction with a two inch narrow tire height at the width you want. This method is called "Plus Two".
The first number in the size code is the width of the tire, measured from sidewall to sidewall, in millimeters. To convert to inches, divide by 25.4. For example, the width of 215mm is equal to 8.46.
The second number is the aspect ratio (profile), or the ratio of sidewall height to width. 70 indicate that the height of the sidewall is 70% (.70) of the width. So, the height of the tire sidewall is 215mm X .70 = 150.5mm or 8.46 X .70 = 5.93.
The "R" indicates a Radial tire design. Virtually all tires available today are of this design.
The last number is the diameter of the wheel and tire in inches.
You should become familiar with some of the technical terms all manufacturers
such as Weld Racing, KMC, and Twenty Inch Strong and our Custom Wheels n Rims Sponsors use to describe custom wheels and custom rims.
Click on the links provided below for more Wheel Tech Articles.
Custom Wheels and Rims Technical Articles
All Wheel Tech Articles
Which wheels or rims fit your vehicle? Technical articles on custom wheel backspace, center bore, measuring lug bolt patterns, offset, plus sizing, torque, wheel construction, wheel spacers and adapters.
Wheel Backspace
Wheel Backspace! Understanding custom wheels and rims backspacing.
