Everything You Ever Wanted To Know About Rims


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Plus Sizing

What is "Inch Up"?
"Inch Up" is the process of mounting a lower aspect ratio tire and larger diameter wheel on your car. This creates a larger contact patch and a shorter sidewall.

Why "Inch Up"?
"Inch Up" to improve your vehicle’s performance and appearance. 

  • Increased Steering Response
  • Improved Dry Handling
  • Enhanced Cornering Ability
  • Aggressive Good Looks
"Inch Up" may be done in several ways. The most
popular are:

  • Plus Zero
    This method utilizes the same wheel diameter as OE, but incorporates a tire with a larger than OE section width and smaller than OE aspect ratio. For example, replacing an OE 175/70R14 tire (on a 5.5-inch wheel) with a 195/60R14 tire would be a proper Plus Zero fitment. Note that this may require a replacement wheel to maintain proper rim width for the new tire.
  • Plus One
    This method utilizes a one-inch larger diameter wheel, in conjunction with a tire of a one-step lower aspect ratio. An example of an appropriate Plus One fitment is to replace an OE 175/70R13 tire (23-inch overall diameter) with a 185/60R14 tire (22.9-inch overall diameter). Note that this method always requires a replacement wheel.
  • Plus Two
    This method utilizes a two-inch larger diameter wheel, in conjunction with a tire of a two-step lower aspect ratio. An example of an appropriate Plus Two fitment is to replace an OE 175/70R13 tire (23-inch overall diameter) with a 195/50R15 tire (22.8-inch overall diameter).
Warning:
When changing to a non-OE tire size, always consult the load/inflation charts to determine proper inflation pressure to maintain OE load-carrying capacity.

Categories: Mustang Tech

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