37X12.5R20 conversion to metric size

37X12.5R20 tires are 37.0″ tall, have a section width of 12.5″, and fit wheels with a diameter of 20. The circumference is 116.2″ that translates into 545 revolutions per mile. As a rule, they can be mounted on the wheels with 20″ x 8.5-11″ rim width. In the metric system, the equivalent tire size is 318/68/R20.

What is 37X12.5R20 in inches?

Tire Diameter:37.0″
Tire Section Width:12.5″
Rim Width Range:20″ x 8.5-11″
Sidewall Height:8.5″
Circumference:116.2″
Revs/Mile:545

Alternate sizes – Upsizing Wheels or Tires?

What are 37X12.5R20 close equivalents?

Check out the chart below to find possible alternatives to the 37X12.5R20 tire size staying within the 3%-range of the tire diameter, allowing to choose wider wheels or tires with smaller sidewalls. A good rule of thumb is to avoid decreasing the diameter of the wheel. If you are not sure about the custom sizes, consult the experts or stick to the factory tire size.

Tire sizeDiameterDifferenceWidthWheel size
343/59/R2036.0″-2.7%13.5″20
394/52/R2036.0″-2.7%15.5″20
375/55R2036.2″-2.16%14.8″20
292/74/R2037.0″0%11.5″20
343/63/R2037.0″0%13.5″20
368/59/R2037.0″0%14.5″20
343/67/R2038.0″2.7%13.5″20
394/58/R2038.0″2.7%15.5″20
Upsizing chart

How to decode 37X12.5R20 tire size in metric?

Trying to decode the size of the tires? Scroll down the page to learn what all these numbers on the sidewall stand for.

P or LTThe first letter in the string denotes the class. P stands for passenger vehicles, LT is intended for light trucks carrying heavy loads.
318It means the width of the tire is 318 millimeters
68The tire has an aspect ratio of 68. To put it simple, the sidewall height is 68% of the width, so it would be 8.5″.
RR stands for the Radial, a standard construction method for about 99% of tires.
20The tire is designed to fit 20″ x 8.5-11″ rims that are 20 inches in diameter.

Popular questions about 37X12.5R20 tire size

How wide is a 37X12.5R20 tire?

The tires of the given size have a section width of 12.5″ inches.

How tall is a 37X12.5R20 tire?

The height of the following tire size equals 37.0″ inches.

What rims will fit 37X12.5R20 tires?

For each tire size, often there are several wheel sizes. You can’t put very wide tires on narrow rims or vise versa. You need the rim size of 20″ x 8.5-11″ for 20″ x 8.5-11″ tires.

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