With the conversion calculator (Thank you Ron) I get this result below.
(My tires 295.50/15)
http://www.redrock4x4.com/tech/tire_...&method=metric
Metric Tire Conversion Calculator
Use these calculators to convert metric tire sizes (ie 285/75R16) to standard tire sizes (ie 31x10.50R15) and vice versa.
Metric to Standard Conversion
Enter the tire size below (ex 265/75/16)
/ R
Standard to Metric Conversion
Enter the tire size below (ex 31x10.50/15)
x R
Result:
295/50/15 = 26.6x11.6/15