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CUSTOMIZING
ASPECT RATIO CALCULATOR
To calculate aspect ratio, divide the tire's section height by its
section width as shown below.
Section Height / Section Width = Aspect Ratio
To determine the aspect ratio of the same P255/50VR16 tire:
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This example indicates an approximate 50-series tire when mounted
on its measuring rim width.
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For wider-than-design measuring rim width wheels:
When this same tire is mounted on a wider-than-design rim width
wheel, the specifications can change dramatically. The tire's
section width increases by 0.2" for every 0.5" increase in rim
width. The difference between a 7.0" and a 9.5" wide wheel measures
2.5". The width difference of 2.5" equals five increments of
0.5":
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For the increase in section width, multiply 0.2" by the
corresponding five increments for a total of 1.0." Adding that
to the original section width results in a new measurement of
approximately 11.2".
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Because the overall diameter of a radial is determined by
its belts, this tire's overall diameter should remain virtually
unchanged. To calculate the new aspect ratio we repeat the earlier
calculation, this time substituting the revised section width of
11.2."
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