View Here : Tire Conversion Chart
Vintage Tire Size Conversion Chart. Use the following chart to figure out the closest modern tire size to your car's original tires. Keep in mind these are close approximations and may not be exact replacements.
Old Size: Letter Size: 82 Series: 80 Series: 75 Series: 70 Series: 65 Series: 60 Series: 50 Series: 6.00-14 : 155R14 : 175/70R14: 185/65R14 : 6.45-14 : 155R14 : 175/70R14
Browse our tire conversion charts by wheel size or tire diameter to find the tire conversion you're looking for. Every tire size is listed with its metric measurements and inch size equivalent.
Alpha numeric tire sizes were introduced as Original Equipment in the late 60s and became widely used in the early 70s. These tires were identified with a letter which indicated the tire's load capacity, followed by an "R" if radial ply construction, the tire's aspect ratio and wheel diameter.
Sidewall Markings. There is a lot of information on the sidewall of a tire. Typically, you'll find UTQG ratings for treadwear, traction and temperature, the size of the tire, the load rating index number with a speed rating index, the construction type (bias or radial), the D.O.T. (Dept. of Transportation) compliance code, construction details, and of course, the make and model of the tire.
Listing in chart does not imply complete interchangeability. When changing tire sizes, dimensional clearances must be checked.
Below is a chart to convert your bias tire size to a radial size for tractor tires.
Metric tire conversion can be quite a pain. With inch tire sizes the first number is the height and the second is the width. Well, with metric sizes the first number is the width and the second is the percent of the width that is the sidewall height.
The values shown are calculated measurements based on the p-metric formula. Actual advertised tire height and tread width will vary from manufacturer to manufacturer for specific p-metric tire sizes.