[img]http://www.whizzerick.com/tire.jpg[/img]

A - 215 = tire width in millimeters (at contact point)

B - 85R = sidewall height is 85% of width (85% of 215 MM = 182,5mm / 7,25 inches) - also called 'aspect ratio'. R for radial.

C - 16 = total wheel diameter (from lip to lip)

D - That tire is 30,25 inches in diameter:

1953 Chevrolet 1300 - Daily driver
Collecting Vintage Whizzer motorbikes
http://www.whizzerick.com