235/70 is the same width as a 235/60. The difference it the height. Metric tire sizes break down like this:
235/70/15
235 = section width in mm (not across the tread, but the widest point. Different manufacturers vary on this so some have wider tread than others. divide by 25.4 to convert to inches. 235 / 25.4 = 9.25"
70 = aspect ration. The percentage of the section width that the sidewall is high. example = 235 x .7 = 164.5mm The height of the side wall from the lip to the top of the tire is 164.5mm or 164.5 / 25.4 = 6.47" high.
15 = rim diameter in inches
Section height x 2 + rim diameter give you overall height.
6.47" x 2 = 12.94 + 15" = 27.94"
As for the sizes in the picture, I can only guess. The front is NOT 235/70 though. More like 255/60 or something. (it appears to be a 16" wheel. The rear is probably the standard 33x14.5x15 Mikey Thompson tire that everyone uses. Still, only guessing.
Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project