Are 33-inch tires the same as 285? Car tires, like other parts, vary in sizes and shapes. This can confuse newcomers, especially since manufacturers use different criteria for measurement. Lately, we’ve received many questions. One common one is, “Can I swap 33-inch and 285 tires?” This article aims to clear up this confusion.
Are 33 inch tires the same as 285?
Many are unsure if “33-inch tires” and “285 tires” are the same. They often think they’re different.
The answer is yes. “285 tires” indicate width in millimeters, while “33-inch tires” show diameter. They are similar in size. Yet, the different measurement systems cause confusion. For example, “285” means 285/75/16. This equals the metric for 33 inches.
| Measurement | 33 inches tires (285/75/16) |
| Diameter | 32.8″ (883mm) |
| Width | 11.2″ (285mm) |
| Sidewall | 8.4″ (213mm) |
| Circumference | 103.1″ (2619mm) |
| Revs/Mile | 615 (382mm) |
Comprehending tire sizes
285 tires come from the metric system. They’re identified by percentage, inches, and millimeters. Other factors, like sidewalls, rims, and stock ratios, vary. Therefore, 285 tires from different makers might not have the same diameters.
Conversely, 33-inch tires are purely from the imperial system, using only inches. They don’t consider aspect ratios or sidewalls. Thus, 33-inch tires from different makers have the same diameter.
So, it’s not surprising that 33-inch tires are slightly larger than 285 tires. They are 1% larger, with a diameter difference of 0.32 inches or 8.04 mm.
Their circumferences also differ. The circumference of 285 tires is 102.76 inches. In contrast, 33-inch tires have a circumference of 103.75 inches, a 1% difference, or 0.99 inches.
| Tire Size (mm) | Tire Size (Inches) | Overall Diameter (mm) | Overall Diameter (Inches) | Tread Width | Tread Wit | Rim Diam | Rim Diam | Sidewall Height (m | Sidewall Height (Inches) |
| 285/75R16 | 32.8X11.2 | 834 | 32.8 | 285 | 11.2 | 406 | 16 | 214 | 8.4 |
| 285/70R17 | 32.7X11.2 | 831 | 32.7 | 285 | 11.2 | 432 | 17 | 200 | 7.9 |
| 285/65R18 | 32.6X11.2 | 828 | 32.6 | 285 | 11.2 | 457 | 18 | 185 | 7.3 |
| 285/55R20 | 32.4X11.2 | 822 | 32.4 | 285 | 11.2 | 508 | 20 | 157 | 6.2 |
| 285/45R22 | 32.1X11.2 | 815 | 32.1 | 285 | 11.2 | 559 | 22 | 128 | 5 |
| 285/75R17 | 33.8X11.2 | 859 | 33.8 | 285 | 11.2 | 432 | 17 | 214 | 8.4 |
| 285/70R18 | 33.7X11.2 | 856 | 33.7 | 285 | 11.2 | 457 | 18 | 200 | 7.9 |
| 285/60R20 | 33.5X11.2 | 850 | 33.5 | 285 | 11.2 | 508 | 20 | 171 | 6.7 |
| 285/50R22 | 33.2X11.2 | 844 | 33.2 | 285 | 11.2 | 559 | 22 | 143 | 5.6 |
What is a prefix on tires?
Tire prefixes divide tires into four types. They are: P for passenger cars, T for temporary spares, LT for light trucks, and ST for trailers.
What is section width?
Section width refers to the general width of a tire, measured in millimeters. It is labeled when the tire is mounted on the appropriate width rim.
What is aspect ratio?
The aspect ratio shows the tire’s sidewall height compared to its width. It’s expressed as a percentage. This makes it simple to compare tire sizes and shapes. For example, a 50-series tire has a sidewall half its width.
What is speed rating?
The speed rating shows a tire’s top speed, usually on its sidewall. High-quality tires might even have Z-rated options.
What is tire construction?
Tire construction involves two main terms. “R” is for radial-ply tires. “D” is for bias-ply tires, which are mainly used on trailers and trucks.
What is BMC (Body Mount Chop)?
BMC refers to cutting a part of a vehicle’s chassis. This is often needed for vehicles with safety features integrated into the chassis. It’s especially necessary when fitting larger tires.
What are tire sizes?
Tire size is the rim’s diameter, usually measured in inches. However, some special tires use a metric system for this. An example is the PAX system.
Can We Use 33” and 285 Tires Together?
No, Their sizes differ slightly. Avoid mismatching mud tires. This mix-up can harm your vehicle, especially on tough roads. It reduces tread, grip, and traction. This leads to power loss and crashes.
It’s best to use either 33-inch or 285mm tires, but not both. You can switch a full set of 285mm tires for four 33-inch tires. But, never mix them.
Conclusion
“Are 33-inch tires the same as 285?” We’re in a classic debate: pineapple on pizza or manual transmissions? (Hint: manuals win). The 33-inch vs. 285mm tire debate seems minor but never ends.
In the big picture, an inch or millimeter doesn’t matter much. The best tire fits your needs and style, adding a touch of style in the lot.
Maybe one day, the industry will standardize or even add a new size. For now, drive safely, check your measurements, and remember, rolling style is key.