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Plus Sizing and Inching Up

Two ways of improving your vehicle's look and performance, are Plus Sizing and Inching Up.

Plus Sizing

One of the easiest ways to improve the performance of your vehicle is with Plus Sizing wheels and tyres. Plus Sizing refers to tyres that are wider and have a shorter sidewall. The rim size (reflected in inches) and side wall size (absolute dimensions) stay the same. The sidewall size description however, changes as it is reflected as an "aspect ratio" rather than as an absolute dimension. The result is a larger contact patch and sportier performance.

Plus Sizing will improve your vehicles:

  • Steering response
  • Handling
  • Cornering ability

Inch Up

Inch Up is similar to Plus Sizing. It involves mounting a lower aspect ratio tyre and larger diameter wheel/rim on your car. This effect creates a larger contact patch and a shorter sidewall. Inch Up to improve your vehicle's performance and appearance.

  • Increased steering response
  • Improved dry handling
  • Enhanced cornering ability
  • Aggressive good looks

How Can You Inch Up?

Inch Up with Autoquip, the experts. The most popular methods are:

  1. Plus Zero
    This method utilizes the same wheel diameter as Original Equipment (OE) but incorporates a tyre with a larger than OE section width and smaller than OE aspect ratio. For example, replacing an OE 175/70R14 tyre (on a 5.5-inch wheel) with a 195/60R14 tyre would be a proper Plus Zero fitment. Note that this practice may require a replacement wheel in order to maintain proper rim width for the new tyre.
  2. Plus One
    This method utilizes a one-inch larger diameter wheel in conjunction with a tyre of a one-step lower aspect ratio. An example of an appropriate Plus One fitment is to replace an OE 175/70R13 tyre (23-inch overall diameter) with a 185/60R14 tyre (22.9-inch overall diameter). Note that this method always requires a replacement wheel.
  3. Plus Two
    This method utilizes a two-inch larger diameter wheel in conjunction with a tyre of a two-step lower aspect ratio. An example of an appropriate Plus Two fitment is to replace an OE 175/70R13 tyre (23-inch overall diameter) with a 195/50R15 tyre (22.8-inch overall diameter).

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