285/40R15 Tire Size in Inches and Millimeters
285/40R15 tires have a diameter of 24" (609 mm), a tread width of 11.2" (285 mm), and a wheel diameter of 15" (381 mm).The sidewall of the tire is 4.5" (114 mm), and the tire's circumference is 75.4" (1912.3 mm). This means a 285/40R15 tire will make make 840 revolutions per mile, or 523 revolutions per kilometer.
| Spec | Inches | Metric |
|---|---|---|
| Diameter | 24" | 609 mm |
| Width | 11.2" | 285 mm |
| Wheel | 15" | 381 mm |
| Sidewall | 4.5" | 114 mm |
| Circum | 75.4" | 1912.3 mm |
| Revolutions | 840 per mile | 523 per km |
What Does 285/40R15 Mean?
The tire size 285/40R15 is a common size used on many trucks, SUVs, and other larger vehicles.
Here is what each part of the size designation represents:
- 285: This number represents the width of the tire in millimeters. In this case, the tire is 285 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.
How To Convert 285/40R15 Into Inches
The 285/40R15 conversion is fairly simple. The first number in the tire size, 285, represents the width of the tire in millimeters. To convert this to inches, we divide 285 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 11.2 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 11.2 by 0.40, which gives us approximately 4.5 inches.
Finally, the last number in the tire size, 15, represents the diameter of the wheel rim in inches. Therefore, the tire size 285/40R15 can be expressed in inches as roughly 11.2 inches wide, 4.5 inches tall, and designed to fit a 15-inch wheel rim.
Frequently Asked Questions About 285/40R15 Tires
How tall is a 285/40R15 tire?
A 285/40R15 tire has an approximate height, also known as the overall diameter, of 24 inches (609 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 285/40R15 tire?
A 285/40R15 tire has a width of approximately 11.2 inches (285 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “285”. 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 285/40R15 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.
| Size | Diameter | Width | Wheel |
|---|---|---|---|
| 125/60R18 | 23.9" | 607 mm | 18 mm |
| 125/70R17 | 23.9" | 608 mm | 17 mm |
| 125/80R16 | 23.9" | 606 mm | 16 mm |
| 125/85R16 | 24.3" | 618 mm | 16 mm |
| 125/90R15 | 23.9" | 607 mm | 15 mm |
| 135/60R18 | 24.4" | 619 mm | 18 mm |
| 135/70R16 | 23.5" | 596 mm | 16 mm |
| 135/70R17 | 24.5" | 622 mm | 17 mm |
| 135/80R15 | 23.5" | 597 mm | 15 mm |
| 135/80R16 | 24.5" | 622 mm | 16 mm |
| 135/90R14 | 23.6" | 600 mm | 14 mm |
| 135/90R15 | 24.6" | 625 mm | 15 mm |
| 155/70R15 | 23.6" | 599 mm | 15 mm |
| 155/80R14 | 23.8" | 604 mm | 14 mm |
| 165/65R15 | 23.4" | 595 mm | 15 mm |
| 165/80R13 | 23.4" | 594 mm | 13 mm |
| 165/80R14 | 24.4" | 620 mm | 14 mm |
| 175/45R18 | 24.2" | 615 mm | 18 mm |
| 175/55R16 | 23.5" | 598 mm | 16 mm |
| 175/55R17 | 24.6" | 624 mm | 17 mm |
| 175/60R15 | 23.3" | 591 mm | 15 mm |
| 175/60R16 | 24.3" | 616 mm | 16 mm |
| 175/65R15 | 24" | 609 mm | 15 mm |
| 175/70R14 | 23.7" | 602 mm | 14 mm |
| 175/70R15 | 24.7" | 627 mm | 15 mm |
| 175/75R14 | 24.3" | 618 mm | 14 mm |
| 175/80R13 | 24" | 610 mm | 13 mm |
| 185/50R16 | 23.3" | 592 mm | 16 mm |
| 185/50R17 | 24.3" | 618 mm | 17 mm |
| 185/55R16 | 24" | 610 mm | 16 mm |
| 185/60R15 | 23.7" | 603 mm | 15 mm |
| 185/65R14 | 23.5" | 596 mm | 14 mm |
| 185/65R15 | 24.4" | 621 mm | 15 mm |
| 185/70R14 | 24.3" | 616 mm | 14 mm |
| 185/80R13 | 24.6" | 626 mm | 13 mm |
| 195/35R18 | 23.3" | 593 mm | 18 mm |
| 195/45R17 | 23.9" | 608 mm | 17 mm |
| 195/50R16 | 23.7" | 602 mm | 16 mm |
| 195/55R15 | 23.4" | 595 mm | 15 mm |
| 195/55R16 | 24.4" | 620 mm | 16 mm |
| 195/60R15 | 24.2" | 615 mm | 15 mm |
| 195/65R14 | 24" | 610 mm | 14 mm |
| 195/70R13 | 23.8" | 604 mm | 13 mm |
| 205/35R18 | 23.7" | 601 mm | 18 mm |
| 205/40R17 | 23.5" | 596 mm | 17 mm |
| 205/40R18 | 24.4" | 621 mm | 18 mm |
| 205/45R17 | 24.3" | 616 mm | 17 mm |
| 205/50R16 | 24.1" | 612 mm | 16 mm |
| 205/55R15 | 23.9" | 607 mm | 15 mm |
| 205/60R14 | 23.7" | 602 mm | 14 mm |
| 205/60R15 | 24.7" | 627 mm | 15 mm |
| 205/65R14 | 24.5" | 622 mm | 14 mm |
| 205/70R13 | 24.3" | 618 mm | 13 mm |
| 215/35R18 | 23.9" | 607 mm | 18 mm |
| 215/40R17 | 23.8" | 604 mm | 17 mm |
| 215/45R16 | 23.6" | 600 mm | 16 mm |
| 215/45R17 | 24.6" | 626 mm | 17 mm |
| 215/50R15 | 23.5" | 597 mm | 15 mm |
| 215/50R16 | 24.5" | 622 mm | 16 mm |
| 215/55R15 | 24.3" | 617 mm | 15 mm |
| 215/60R14 | 24.2" | 614 mm | 14 mm |
| 225/30R18 | 23.3" | 593 mm | 18 mm |
| 225/30R19 | 24.4" | 619 mm | 19 mm |
| 225/35R18 | 24.2" | 615 mm | 18 mm |
| 225/40R17 | 24.1" | 612 mm | 17 mm |
| 225/45R16 | 23.9" | 608 mm | 16 mm |
| 225/50R15 | 23.9" | 607 mm | 15 mm |
| 225/55R14 | 23.8" | 604 mm | 14 mm |
| 225/60R14 | 24.6" | 626 mm | 14 mm |
| 235/30R18 | 23.6" | 599 mm | 18 mm |
| 235/30R19 | 24.6" | 625 mm | 19 mm |
| 235/35R18 | 24.4" | 621 mm | 18 mm |
| 235/40R17 | 24.4" | 620 mm | 17 mm |
| 235/45R15 | 23.3" | 593 mm | 15 mm |
| 235/50R15 | 24.3" | 617 mm | 15 mm |
| 235/60R13 | 24.1" | 612 mm | 13 mm |
| 245/30R18 | 23.8" | 605 mm | 18 mm |
| 245/35R17 | 23.8" | 604 mm | 17 mm |
| 245/45R16 | 24.6" | 626 mm | 16 mm |
| 245/50R14 | 23.7" | 602 mm | 14 mm |
| 245/50R15 | 24.7" | 627 mm | 15 mm |
| 255/30R18 | 24.1" | 611 mm | 18 mm |
| 255/45R15 | 24.1" | 611 mm | 15 mm |
| 265/30R18 | 24.3" | 617 mm | 18 mm |
| 265/35R17 | 24.3" | 618 mm | 17 mm |
| 265/50R14 | 24.5" | 622 mm | 14 mm |
| 275/35R17 | 24.6" | 624 mm | 17 mm |
| 285/40R15 | 24" | 609 mm | 15 mm |
| 345/35R15 | 24.5" | 623 mm | 15 mm |