245/40R15 Tire Size in Inches and Millimeters

245/40R15 tires have a diameter of 22.7" (577 mm), a tread width of 9.6" (245 mm), and a wheel diameter of 15" (381 mm).The sidewall of the tire is 3.9" (98 mm), and the tire's circumference is 71.3" (1811.8 mm). This means a 245/40R15 tire will make make 889 revolutions per mile, or 552 revolutions per kilometer.

245/40R15 Tire Front
9.6"
22.7"
245/40R15 Tire Side
Tire Circumference
71.3"
15"
3.9"
889 Revs/Mile
SpecInchesMetric
Diameter22.7"577 mm
Width9.6"245 mm
Wheel15"381 mm
Sidewall3.9"98 mm
Circum71.3"1811.8 mm
Revolutions889 per mile552 per km

What Does 245/40R15 Mean?

The tire size 245/40R15 is a common size used on many trucks, SUVs, and other larger vehicles.

Here is what each part of the size designation represents:

  • 245: This number represents the width of the tire in millimeters. In this case, the tire is 245 millimeters wide.
  • 40: 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 40% 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.
  • 15: 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 15-inch wheel.

245/40R15 tire size meaning

How To Convert 245/40R15 Into Inches

The 245/40R15 conversion is fairly simple. The first number in the tire size, 245, represents the width of the tire in millimeters. To convert this to inches, we divide 245 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 9.6 inches.

The second number in the tire size, 40, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 9.6 by 0.40, which gives us approximately 3.9 inches.

Finally, the last number in the tire size, 15, represents the diameter of the wheel rim in inches. Therefore, the tire size 245/40R15 can be expressed in inches as roughly 9.6 inches wide, 3.9 inches tall, and designed to fit a 15-inch wheel rim.

Frequently Asked Questions About 245/40R15 Tires

How tall is a 245/40R15 tire?

A 245/40R15 tire has an approximate height, also known as the overall diameter, of 22.7 inches (577 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 245/40R15 tire?

A 245/40R15 tire has a width of approximately 9.6 inches (245 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “245”. 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 245/40R15 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
115/70R1622.4"568 mm16 mm
125/70R1622.9"582 mm16 mm
125/80R1522.9"581 mm15 mm
135/60R1622.4"568 mm16 mm
135/70R1522.5"571 mm15 mm
135/80R1422.5"572 mm14 mm
145/65R1522.4"569 mm15 mm
145/80R1322.1"562 mm13 mm
145/80R1423.1"588 mm14 mm
155/60R1522.3"567 mm15 mm
155/65R1523"583 mm15 mm
155/70R1422.6"574 mm14 mm
155/80R1322.8"578 mm13 mm
165/40R1722.2"564 mm17 mm
165/40R1823.2"589 mm18 mm
165/45R1722.8"580 mm17 mm
165/50R1622.5"572 mm16 mm
165/55R1522.2"563 mm15 mm
165/60R1522.8"579 mm15 mm
165/65R1422.4"570 mm14 mm
165/70R1322.1"562 mm13 mm
165/70R1423.1"588 mm14 mm
165/75R1322.8"578 mm13 mm
165/80R1323.4"594 mm13 mm
175/50R1622.9"582 mm16 mm
175/55R1522.6"573 mm15 mm
175/60R1422.3"566 mm14 mm
175/60R1523.3"591 mm15 mm
175/65R1423"584 mm14 mm
175/70R1322.7"576 mm13 mm
185/50R1522.3"567 mm15 mm
185/50R1623.3"592 mm16 mm
185/55R1422"560 mm14 mm
185/55R1523"585 mm15 mm
185/60R1422.8"578 mm14 mm
185/65R1322.4"570 mm13 mm
185/70R1323.2"590 mm13 mm
195/35R1823.3"593 mm18 mm
195/40R1622.1"562 mm16 mm
195/40R1723.1"588 mm17 mm
195/45R1622.9"582 mm16 mm
195/50R1522.7"577 mm15 mm
195/55R1422.4"570 mm14 mm
195/60R1322.2"564 mm13 mm
195/60R1423.2"590 mm14 mm
195/65R1323"584 mm13 mm
205/40R1622.4"570 mm16 mm
205/45R1522.2"565 mm15 mm
205/45R1623.2"590 mm16 mm
205/50R1422.1"562 mm14 mm
205/50R1523.1"587 mm15 mm
205/55R1422.9"582 mm14 mm
205/60R1322.7"576 mm13 mm
215/35R1722.9"582 mm17 mm
215/40R1622.8"578 mm16 mm
215/45R1522.6"575 mm15 mm
215/60R1323.1"588 mm13 mm
225/30R1823.3"593 mm18 mm
225/35R1723.2"590 mm17 mm
225/40R1623.1"586 mm16 mm
225/45R1523"583 mm15 mm
225/50R1422.9"582 mm14 mm
235/45R1523.3"593 mm15 mm
235/50R1322.3"566 mm13 mm
245/35R1622.8"578 mm16 mm
245/40R1522.7"577 mm15 mm
245/50R1322.7"576 mm13 mm
255/35R1623"584 mm16 mm
275/35R1522.6"573 mm15 mm
295/35R1523.1"587 mm15 mm