295/50-15's

Should be about 26.6" tall in diameter.

Take the width (295 mm) which may be the tread or the sidewalls....whatever
is the widest point when mounted on the median recommended rim width at the
recommended pressure x the aspect ratio (.50) - which is the % the sidewall height
is of the overall width calculated above x 2 (2 sidewalls) divided by 25.4 (converts
to inches) + the rim diameter (15") = the overall diameter in inches.