We've explained dozens of times over the years the difference between P-metric and imperial tire sizes so we won't cover a whole lot of the same ground, but we really haven't published a conversion ...
EDITED BY CHARLES BATES SENIOR EDITOR An easy way to convert metric surface call outs to standard U.S. ones (rms) is to mentally multiply the metric value by 40. For example, 1.6 = 63 rms, 3.2 = 125 ...
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