205/45R15 Tire Size in Inches and Millimeters

205/45R15 tires have a diameter of 22.2" (565 mm), a tread width of 8.1" (205 mm), and a wheel diameter of 15" (381 mm).The sidewall of the tire is 3.6" (92 mm), and the tire's circumference is 69.7" (1774.1 mm). This means a 205/45R15 tire will make make 909 revolutions per mile, or 564 revolutions per kilometer.

205/45R15 Tire Front
8.1"
22.2"
205/45R15 Tire Side
Tire Circumference
69.7"
15"
3.6"
909 Revs/Mile
SpecInchesMetric
Diameter22.2"565 mm
Width8.1"205 mm
Wheel15"381 mm
Sidewall3.6"92 mm
Circum69.7"1774.1 mm
Revolutions909 per mile564 per km

What Does 205/45R15 Mean?

The tire size 205/45R15 is a common size used on many trucks, SUVs, and other larger vehicles.

Here is what each part of the size designation represents:

  • 205: This number represents the width of the tire in millimeters. In this case, the tire is 205 millimeters wide.
  • 45: 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 45% 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.

205/45R15 tire size meaning

How To Convert 205/45R15 Into Inches

The 205/45R15 conversion is fairly simple. The first number in the tire size, 205, represents the width of the tire in millimeters. To convert this to inches, we divide 205 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 8.1 inches.

The second number in the tire size, 45, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 8.1 by 0.45, which gives us approximately 3.6 inches.

Finally, the last number in the tire size, 15, represents the diameter of the wheel rim in inches. Therefore, the tire size 205/45R15 can be expressed in inches as roughly 8.1 inches wide, 3.6 inches tall, and designed to fit a 15-inch wheel rim.

Toyo Tires EXTENSA HPII All-Season Radial Tire - 195/45R15 78V
Toyo Tires EXTENSA HPII All-Season Radial Tire - 195/45R15 78V
Fit type: Universal Fit; Model No: 196310; item package weight: 15.0 pounds
$77.24
Set of 4 (FOUR) Haida Racing HD921 Summer Performance Radial Tires-195/45R15 195/45/15 195/45-15 78V Load Range SL 4-Ply BSW Black Side Wall
Set of 4 (FOUR) Haida Racing HD921 Summer Performance Radial Tires-195/45R15 195/45/15 195/45-15 78V Load Range SL 4-Ply BSW Black Side Wall
Treadlife: N/A; Season: Summer; Performance: Performance; Car Type: Passenger; Load Range SL, 4-Ply Rated, 4-PR
$272.93
Set of 4 (FOUR) Venom Power Ragnarok Zero All-Season High Performance Radial Tires-295/25R22 295/25ZR22 295/25/22 295/25-22 97W Load Range XL 4-Ply BSW Black Side Wall
Set of 4 (FOUR) Venom Power Ragnarok Zero All-Season High Performance Radial Tires-295/25R22 295/25ZR22 295/25/22 295/25-22 97W Load Range XL 4-Ply BSW Black Side Wall
Treadlife: N/A; Season: All Season; Performance: High Performance; Car Type: Passenger; Load Range XL, 4-Ply Rated, 4-PR
$492.93
Nitto Neo Gen All-Season Radial Tire -205/50R15XL 89V
Nitto Neo Gen All-Season Radial Tire -205/50R15XL 89V
3d multiwave sipes further enhance wet traction and help stabilize tread blocks; continuous inner shoulder reduces tread flex for less wear over time
$96.00

Frequently Asked Questions About 205/45R15 Tires

How tall is a 205/45R15 tire?

A 205/45R15 tire has an approximate height, also known as the overall diameter, of 22.2 inches (565 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 205/45R15 tire?

A 205/45R15 tire has a width of approximately 8.1 inches (205 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “205”. 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 205/45R15 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
125/70R1521.9"557 mm15 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
155/60R1522.3"567 mm15 mm
155/65R1422"558 mm14 mm
155/70R1422.6"574 mm14 mm
155/80R1221.8"553 mm12 mm
155/80R1322.8"578 mm13 mm
165/40R1722.2"564 mm17 mm
165/45R1621.8"554 mm16 mm
165/45R1722.8"580 mm17 mm
165/50R1622.5"572 mm16 mm
165/55R1522.2"563 mm15 mm
165/60R1421.8"554 mm14 mm
165/60R1522.8"579 mm15 mm
165/65R1422.4"570 mm14 mm
165/70R1322.1"562 mm13 mm
165/75R1322.8"578 mm13 mm
175/50R1521.9"557 mm15 mm
175/55R1522.6"573 mm15 mm
175/60R1422.3"566 mm14 mm
175/65R1322"558 mm13 mm
175/70R1322.7"576 mm13 mm
185/50R1522.3"567 mm15 mm
185/55R1422"560 mm14 mm
185/60R1321.7"552 mm13 mm
185/60R1422.8"578 mm14 mm
185/65R1322.4"570 mm13 mm
195/40R1622.1"562 mm16 mm
195/45R1521.9"557 mm15 mm
195/50R1522.7"577 mm15 mm
195/55R1422.4"570 mm14 mm
195/60R1322.2"564 mm13 mm
205/40R1622.4"570 mm16 mm
205/45R1522.2"565 mm15 mm
205/50R1422.1"562 mm14 mm
205/60R1322.7"576 mm13 mm
215/35R1621.9"556 mm16 mm
215/40R1521.8"553 mm15 mm
215/40R1622.8"578 mm16 mm
215/45R1522.6"575 mm15 mm
225/45R1422"558 mm14 mm
225/50R1321.9"556 mm13 mm
235/50R1322.3"566 mm13 mm
245/35R1521.8"553 mm15 mm
245/35R1622.8"578 mm16 mm
245/40R1522.7"577 mm15 mm
245/50R1322.7"576 mm13 mm
275/35R1522.6"573 mm15 mm