1.Locate the vehicle's original equipment tire aspect ratio.
Look along the top of the chart.

2.Locate the vehicle's original equipment tire section width.
Go down that column until you find the section width (in millimeters).

3.Verify that the existing wheel is acceptable for the new tire.
The tire widths on the same line, listed horizontally, along with their corresponding aspect ratio are the Plus Zero options or original rim diameters.

4.Figure the Plus One Option.
Start with the original section width and aspect ratio and move up one line and to the right two columns to find the new section width and aspect ratio. The use of a Plus One tire size will require the use of a new wheel. Verify that the new wheel's offset and rim width are correct.

5.Figure the Plus Two option.
Start with the original section width and aspect ratio, and move up two lines and to the right four columns, to find the new section width and aspect ratio. The use of a Plus Two tire size also requires the use of a new wheel. Verify that the new wheel's offset and rim width are correct.

6.Check load-carrying capacity of selected Plus Fitment.
While the chart below will help provide a plus tire size with approximately the same overall diameter as the OE tire, load-chart comparison should always be checked to ensure an adequate load-carrying capacity of plus fitment. If a plus size does not have adequate load-carrying capacity, it may be necessary to increase the plus tire size by 10 mm to achieve the proper load-carrying capacity.

Warning: In all applications, you must verify that the new tire's load-carrying capacity equals or exceeds the load-carrying capacity of the original equipment tire and/or the vehicle's front and rear Gross Axle Weight Rating (GAWR) and the vehicle's Gross Vehicle Weight Rating (GVWR). This chart spans a tire section width range of 7.8 in. (200 mm), which makes on-vehicle clearance checks mandatory.

Plus Zero: Same Line
Plus One: One Line Up and Two Columns Right
Plus Two: Two Lines Up and Four Columns Right
Plus Three: Three Lines Up and Six Columns Right

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