145/80R12 Tire Size in Inches and Millimeters

145/80R12 tires have a diameter of 21.1" (537 mm), a tread width of 5.7" (145 mm), and a wheel diameter of 12" (304.8 mm).The sidewall of the tire is 4.6" (116 mm), and the tire's circumference is 66.3" (1686.2 mm). This means a 145/80R12 tire will make make 956 revolutions per mile, or 593 revolutions per kilometer.

145/80R12 Tire Front
5.7"
21.1"
145/80R12 Tire Side
Tire Circumference
66.3"
12"
4.6"
956 Revs/Mile
SpecInchesMetric
Diameter21.1"537 mm
Width5.7"145 mm
Wheel12"304.8 mm
Sidewall4.6"116 mm
Circum66.3"1686.2 mm
Revolutions956 per mile593 per km

What Does 145/80R12 Mean?

The tire size 145/80R12 is a common size used on many trucks, SUVs, and other larger vehicles.

Here is what each part of the size designation represents:

  • 145: This number represents the width of the tire in millimeters. In this case, the tire is 145 millimeters wide.
  • 80: This number represents the aspect ratio of the tire, which is the height of the tire's sidewall as a percentage of its width. In this case, the sidewall height is 80% of the tire's width.
  • R: This letter indicates the tire's construction type. “R” stands for radial construction, which is the most common type of tire construction today.
  • 12: This number represents the diameter of the wheel that the tire is designed to fit on, in inches. In this case, the tire is designed to fit on a 12-inch wheel.

145/80R12 tire size meaning

How To Convert 145/80R12 Into Inches

The 145/80R12 conversion is fairly simple. The first number in the tire size, 145, represents the width of the tire in millimeters. To convert this to inches, we divide 145 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 5.7 inches.

The second number in the tire size, 80, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 5.7 by 0.80, which gives us approximately 4.6 inches.

Finally, the last number in the tire size, 12, represents the diameter of the wheel rim in inches. Therefore, the tire size 145/80R12 can be expressed in inches as roughly 5.7 inches wide, 4.6 inches tall, and designed to fit a 12-inch wheel rim.

Frequently Asked Questions About 145/80R12 Tires

How tall is a 145/80R12 tire?

A 145/80R12 tire has an approximate height, also known as the overall diameter, of 21.1 inches (537 mm). This height can vary slightly depending on the brand and model of the tire, as well as the amount of air pressure in the tire.

How wide is a 145/80R12 tire?

A 145/80R12 tire has a width of approximately 5.7 inches (145 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “145”. It’s important to note that the actual width of the tire may vary slightly depending on the brand and model of the tire, and the width may also be affected by the amount of air pressure in the tire.

Alternate 145/80R12 Replacement Tire Sizes

Upsizing your wheels or tires? Replacement tires must be within 3% of the diametor of the original tire. The following sizes fall within that range - click on any size to see detailed info about that tire and wheel combination.

SizeDiameterWidthWheel
105/70R1520.8"529 mm15 mm
115/70R1521.4"543 mm15 mm
125/70R1420.9"532 mm14 mm
125/80R1320.9"530 mm13 mm
135/80R1220.5"521 mm12 mm
135/80R1321.5"546 mm13 mm
145/65R1421.4"544 mm14 mm
145/70R1321"534 mm13 mm
145/80R1221.1"537 mm12 mm
155/55R1420.7"526 mm14 mm
155/65R1320.9"532 mm13 mm
155/70R1220.6"523 mm12 mm
155/70R1321.6"548 mm13 mm
155/80R1221.8"553 mm12 mm
165/40R1621.2"538 mm16 mm
165/45R1520.8"529 mm15 mm
165/50R1420.6"522 mm14 mm
165/50R1521.5"547 mm15 mm
165/55R1421.2"538 mm14 mm
165/60R1320.8"528 mm13 mm
165/65R1321.4"544 mm13 mm
165/70R1221.1"537 mm12 mm
175/50R1420.9"532 mm14 mm
175/55R1320.6"522 mm13 mm
175/60R1321.3"540 mm13 mm
185/45R1521.5"547 mm15 mm
185/50R1421.3"542 mm14 mm
185/55R1321"534 mm13 mm
185/60R1321.7"552 mm13 mm
195/45R1420.9"532 mm14 mm
195/55R1321.4"544 mm13 mm
205/45R1421.3"540 mm14 mm
205/50R1321.1"536 mm13 mm
215/40R1420.8"528 mm14 mm
215/40R1521.8"553 mm15 mm
215/50R1321.5"546 mm13 mm
225/40R1421.1"536 mm14 mm
225/45R1320.9"532 mm13 mm
245/35R1521.8"553 mm15 mm
255/35R1421"534 mm14 mm
255/40R1321"534 mm13 mm