| Plus Size Formula
for Tires |
Many vehicles allow a larger wheel to be installed than came originally on
the vehicle. However it is critical to have the correct tire or you may
experience tire rub. To "plus size" your vehicle you must choose
a tire with basically the same diameter as the original. The following
formula will help you determine overall tire diameter:
Step 1: Tire width (in Millimeters) X .03943 (ex. if tire size is P215/65R15
the tire width in millimeters is 215).
Step 2: Multiply your answer by the aspect ratio (ex. if tire size is
P215/65R15 the aspect ratio is 65%).
Step 3. Multiply your answer by 2 and then add the rim diameter.
To plus size a vehicle with 15" rims to 16" rims when the factory
tire is P215/65R15, the original diameter is 24.72 inches. Recommended
plus size in 16" is P225/50R16 which has a diameter of 24.88.
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