Metric Tire Size Conversion Chart

METRIC TIRE SIZE CONVERSION CHART




15 inch tires sizes

WidthAspectWheel DiameterSection Width
2057015 26.38.1
2457015 28.59.6
2057515 27.18.1
2157515 27.78.5
2257515 28.38.9
2357515 28.99.3
2457515 29.59.6
2657515 30.610.4
2158515 29.48.5
2458515 31.49.6
2758515 33.410.8
3158515 36.112.4
3256015 30.412.8

16 inch tires sizes

WidthAspectWheel DiameterSection Width
3056516 31.612.0
3456516 33.713.6
2457016 29.59.6
2557016 30.110.0
3057016 32.812.0
2257516 29.38.9
2457516 30.59.6
2657516 31.610.4
2857516 32.811.2
2957516 33.311.6
3157516 34.512.3
2158516 30.48.5
2358516 31.79.3
2558516 33.110.0
2658516 33.710.4
3058516 36.412.0



The above numbers are computed values and some rounding has been done on the computed values. The actual tire sizes can and will vary depending on the tire manufacturer.


For another example of a tire cross reference chart, see Tireracks Diameter Comparison Chart



To compute the values in the table above, use the formula of:


HEIGHT = ((width * aspect-ratio * 2) / 2550) + rim size

WIDTH = (width / 25.50 )

For example, a 235/75R15 tire is ((235*75*2)/2550)+15) = 28.8 inches of tire height. The tire width is figured by 235/25.5 = 9.21


Metric tire sizes are stated as three numbers. The way it reads is:

width / aspect ratio R tire rim size
235 / 75 R 15




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