285/70R17 Tire Size in Inches and Millimeters

285/70R17 tires have a diameter of 32.8" (832 mm), a tread width of 11.2" (285 mm), and a wheel diameter of 17" (431.8 mm).The sidewall of the tire is 7.9" (200 mm), and the tire's circumference is 103" (2612.5 mm). This means a 285/70R17 tire will make make 615 revolutions per mile, or 383 revolutions per kilometer.

285/70R17 Tire Front
11.2"
32.8"
285/70R17 Tire Side
Tire Circumference
103"
17"
7.9"
615 Revs/Mile
SpecInchesMetric
Diameter32.8"832 mm
Width11.2"285 mm
Wheel17"431.8 mm
Sidewall7.9"200 mm
Circum103"2612.5 mm
Revolutions615 per mile383 per km

What Does 285/70R17 Mean?

The tire size 285/70R17 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.
  • 70: 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 70% 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.
  • 17: 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 17-inch wheel.

285/70R17 tire size meaning

How To Convert 285/70R17 Into Inches

The 285/70R17 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, 70, 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 0.70, which gives us approximately 7.9 inches.

Finally, the last number in the tire size, 17, represents the diameter of the wheel rim in inches. Therefore, the tire size 285/70R17 can be expressed in inches as roughly 11.2 inches wide, 7.9 inches tall, and designed to fit a 17-inch wheel rim.

Best 285/70R17 Tire
NITTO 285/70R17 116Q SL Nitto Ridge Grappler BW Tire
4.7
$273.99

The NITTO 285/70R17 116Q SL Nitto Ridge Grappler BW Tire embodies versatility and ruggedness, engineered to excel both on and off the road. Its innovative hybrid tread pattern combines the best of all-terrain and mud-terrain designs, providing exceptional traction on diverse surfaces. With its 285/70R17 size and 116Q load rating, this tire offers optimal strength and stability, making it suitable for a wide range of trucks and SUVs. Whether conquering rocky trails or cruising on highways, the Nitto Ridge Grappler delivers a smooth ride, confident handling, and long-lasting performance.

More Info
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03/17/2024 10:04 pm GMT

Frequently Asked Questions About 285/70R17 Tires

How tall is a 285/70R17 tire?

A 285/70R17 tire has an approximate height, also known as the overall diameter, of 32.8 inches (832 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 285/70R17 tire?

A 285/70R17 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.

Understanding Tire Speed Ratings

When choosing the right tires for your vehicle, understanding the speed rating is crucial. But what exactly is a speed rating, and why does it matter?

What is a Tire Speed Rating?

A tire's speed rating indicates the maximum speed a tire can safely sustain over time. It's a manufacturer's assurance of tire performance, marked by a letter on the tire's sidewall. This rating is determined under controlled laboratory conditions and is part of a broader standard established by industry entities like the European Tyre and Rim Technical Organisation (ETRTO) and the U.S. Department of Transportation.

Common Speed Ratings Explained

  1. P-Rated: Up to 94 mph - Suitable for smaller sedans or light-duty vehicles.
  2. Q-Rated: Up to 100 mph - Often found on SUVs and light trucks with consistent highway use.
  3. R-Rated: Up to 106 mph - Typically for medium-duty trucks and vans.
  4. S-Rated: Up to 112 mph - Common for family sedans and larger vehicles with moderate performance.
  5. T-Rated: Up to 118 mph - Optimal for family vehicles, including minivans and some coupes.

Why is the Speed Rating Important?

The speed rating is not just about how fast you can legally drive; it's about safety and performance:
  • Ensures Safety: It guarantees that the tire can handle certain speeds without overheating and failing, which can prevent blowouts.
  • Optimizes Performance: Higher ratings often indicate better handling characteristics, important for maintaining vehicle stability.
  • Legal and Insurance Considerations: Matching the speed rating suggested by your vehicle manufacturer can be essential for insurance and warranty purposes.
When choosing tires, always refer to your vehicle’s manual to ensure compatibility. Remember, fitting tires with a lower speed rating than recommended can compromise safety and performance, while higher ratings might not provide extra benefits unless you frequently drive at high speeds. By understanding these nuances, you can make an informed choice that suits your driving habits while keeping safety a top priority.

Alternate 285/70R17 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
225/90R1632"812 mm16 mm
235/75R1831.9"809 mm18 mm
235/80R1731.8"808 mm17 mm
235/85R1732.8"832 mm17 mm
255/30R2632"814 mm26 mm
255/60R2032"814 mm20 mm
255/65R1932.1"815 mm19 mm
255/70R1832.1"815 mm18 mm
255/75R1732"814 mm17 mm
255/80R1733.1"840 mm17 mm
255/85R1633.1"840 mm16 mm
265/50R2232.5"825 mm22 mm
265/60R2032.5"826 mm20 mm
265/70R1832.6"829 mm18 mm
265/80R1632.7"830 mm16 mm
275/25R2833.4"849 mm28 mm
275/50R2131.9"809 mm21 mm
275/50R2232.9"835 mm22 mm
275/55R2031.9"810 mm20 mm
275/60R2033"838 mm20 mm
275/65R1832.1"815 mm18 mm
275/70R1732.2"818 mm17 mm
275/70R1833.2"843 mm18 mm
285/35R2431.9"810 mm24 mm
285/40R2332"812 mm23 mm
285/40R2433"838 mm24 mm
285/45R2232.1"815 mm22 mm
285/50R2233.3"845 mm22 mm
285/55R2032.4"822 mm20 mm
285/60R2033.5"850 mm20 mm
285/65R1832.6"827 mm18 mm
285/70R1732.8"832 mm17 mm
285/75R1632.8"834 mm16 mm
295/25R2631.8"808 mm26 mm
295/30R2633"838 mm26 mm
295/35R2432.1"816 mm24 mm
295/40R2433.3"846 mm24 mm
295/45R2232.5"825 mm22 mm
295/50R2233.7"855 mm22 mm
295/55R2032.8"832 mm20 mm
295/65R1833.1"841 mm18 mm
295/70R1733.3"846 mm17 mm
295/75R1633.4"848 mm16 mm
305/25R2632"812 mm26 mm
305/30R2633.2"844 mm26 mm
305/35R2432.4"824 mm24 mm
305/40R2332.6"828 mm23 mm
305/40R2433.6"854 mm24 mm
305/45R2232.8"833 mm22 mm
305/50R2032"814 mm20 mm
305/55R2033.2"844 mm20 mm
305/60R1832.4"823 mm18 mm
305/65R1732.6"828 mm17 mm
305/65R1833.6"853 mm18 mm
305/70R1531.9"809 mm15 mm
305/70R1632.8"834 mm16 mm
315/35R2432.7"830 mm24 mm
315/45R2132.2"817 mm21 mm
315/45R2233.2"843 mm22 mm
315/50R2032.4"824 mm20 mm
315/70R1532.4"823 mm15 mm
315/70R1633.4"848 mm16 mm
325/35R2332"812 mm23 mm
325/40R2232.2"819 mm22 mm
325/45R2233.5"851 mm22 mm
325/50R2032.8"834 mm20 mm
325/60R1833.3"847 mm18 mm
335/30R2432"812 mm24 mm
345/55R1732"812 mm17 mm
355/40R2233.2"843 mm22 mm
375/45R2033.3"846 mm20 mm
375/50R1832.8"833 mm18 mm
375/55R1632.2"818 mm16 mm
405/25R2432"812 mm24 mm