How Big Is a 285 Tire? Full Size Breakdown & Dimensions
A 285 tire is a wide truck/SUV tire size, but the exact height depends on the full size code after the 285. For example, a 285/70R17 is about 11.2 inches wide and roughly 32.7 to 32.8 inches tall. A 285/75R17 is taller, while a 285/60R18 is shorter. Before buying, check the tire maker’s spec sheet, your wheel width, wheel offset, and available clearance.
Quick Answer
A 285 tire is about 285 mm wide, or about 11.2 inches from sidewall to sidewall. A common size, 285/70R17, is about 32.7 to 32.8 inches tall with a sidewall near 7.85 inches. It is usually considered a 33-inch-class tire, not a true 35.
Key Takeaways
- A 285 tire has a nominal section width of 285 mm, which equals about 11.2 inches.
- A 285/70R17 is about 32.7 to 32.8 inches tall, depending on the tire model.
- Compared with a 265/70R17, a 285/70R17 is about 0.8 inch wider and about 1.1 inches taller.
- Many LT285/70R17 tires list approved rim widths around 7.5 to 9.0 inches, but you should always verify the exact tire’s spec sheet.
- Fitment depends on wheel width, offset, suspension height, fender clearance, body-mount clearance, and the tire’s actual measured dimensions.
How Big Is a 285 Tire in Inches?
A 285 tire is about 11.2 inches wide because 285 millimeters converts to 11.22 inches. That number is the tire’s nominal section width, which means the measurement from one sidewall to the other when the tire is mounted on its measured rim width.
The height is not controlled by “285” alone. You need the full tire size, such as 285/70R17, to calculate diameter. In that example, the sidewall is 70% of 285 mm, and the tire fits a 17-inch wheel. That gives you an overall diameter of about 32.7 inches.
Note: Tire sizes are nominal. Actual mounted diameter and section width can vary by brand, tread design, load range, and measured rim width, so use the manufacturer’s spec sheet when fitment is tight.
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What Does 285 Mean on a Tire?
The 285 in a tire size is the section width in millimeters. In a size like 285/70R17:
- 285 = nominal section width in millimeters
- 70 = aspect ratio, meaning the sidewall height is 70% of the tire width
- R = radial construction
- 17 = wheel diameter in inches
You can verify this size-code structure through tire safety guides from Bridgestone Americas and the Tire Industry Association. The key point is simple: 285 tells you width, not total height.
285 Tire Width, Sidewall, and Diameter
A 285 tire’s width is easy to convert, but the sidewall and diameter depend on the aspect ratio and wheel size. The standard calculation is:
- Section width: 285 mm ÷ 25.4 = 11.22 inches
- Sidewall height: 285 mm × aspect ratio ÷ 25.4
- Overall diameter: wheel diameter + two sidewalls
285 Width Specs
A 285 tire has a nominal width of about 11.2 inches. Compared with a 265 tire, it is about 20 mm wider, or about 0.79 inch. That extra width can create a wider stance and a larger contact patch, but it can also bring the tire closer to the fender liner, upper control arm, mud flap, or body mount.
Sidewall and Diameter
For a 285/70R17, the sidewall height is about 199.5 mm, or 7.85 inches. Add two sidewalls to the 17-inch wheel, and the overall diameter is about 32.7 inches. Some manufacturer spec sheets round that to about 32.8 inches.
| Size | Width | Sidewall | Overall Diameter |
| 285/70R17 | About 11.2 in | About 7.85 in | About 32.7–32.8 in |
285 Tire Sizes by Wheel Diameter
Not every 285 tire is the same height. A 285/60R18, 285/70R17, and 285/75R17 all share the same nominal width, but they have different sidewall heights and overall diameters.
| Common 285 Size | Approx. Diameter | Best Described As |
| 285/75R16 | About 32.8 in | 33-inch class |
| 285/70R17 | About 32.7–32.8 in | 33-inch class |
| 285/75R17 | About 33.8 in | Tall 33-inch class |
| 285/65R18 | About 32.6 in | 33-inch class |
| 285/60R18 | About 31.5 in | 32-inch class |
| 285/55R20 | About 32.3 in | 32-inch class |
These are calculated dimensions. A real tire can measure slightly taller, shorter, wider, or narrower once mounted and inflated.
Will 285 Tires Fit Stock Wheels?
A 285 tire can fit many stock truck wheels, but you need to match the tire to the wheel width and check the vehicle’s clearance. Many common LT285/70R17 tires list approved rim widths around 7.5 to 9.0 inches, including examples in the BFGoodrich All-Terrain T/A KO2 specifications and Cooper Discoverer AT3 XLT specifications. Other 285 sizes can have different requirements, so never rely on one generic rim-width number.
| Fitment Check | What to Confirm |
| Wheel width | Must fall within the tire manufacturer’s approved rim-width range. |
| Offset and backspacing | Controls whether the tire moves toward the suspension or toward the fender. |
| Fender and liner clearance | Check at full steering lock and during suspension compression. |
| Upper control arm clearance | A wider tire can rub the arm, especially with high-positive-offset wheels. |
| Load index and speed rating | Match or exceed the vehicle requirement unless the manufacturer says otherwise. |
Warning: Do not choose a 285 tire only because the diameter looks right. A tire with the wrong load index, speed rating, rim-width range, or clearance can create safety and handling problems.
How Much Clearance Do 285s Need?
There is no single clearance number that works for every vehicle. A 285 tire may clear easily on one truck and rub badly on another because wheel offset, suspension height, caster, fender shape, mud flaps, and body-mount location all matter.
For a common 285/70R17, plan around a tire that is about 32.7 to 32.8 inches tall and about 11.2 inches wide before brand-specific variation. Then check the tire at:
- Full steering lock, both left and right
- Reverse steering, where rubbing often shows up first
- Suspension compression, especially off-road or with a loaded bed
- Inner fender liner and mud flap areas
- Upper control arm and sway bar clearance
- Body mount or cab mount area on trucks known for tight clearance
Compared with a 265/70R17, a 285/70R17 adds about 1.1 inches of overall diameter, so the axle and underbody gain about 0.55 inch of height. That is helpful, but it is not the same as adding a full inch of ground clearance.
Pro Tip: If you are close on clearance, choose the exact tire model before making fitment decisions. Two 285/70R17 tires can have different real-world section widths, tread widths, shoulder shapes, and weights.
How 285 Tires Change Truck Stance
A 285 tire can make a truck look more planted because it is wider than common 255, 265, and 275 sizes. The wider footprint fills the wheel well more, and a 285/70R17 usually adds visible height compared with a 265/70R17.
The change is not only visual. A wider tire can improve flotation on sand, snow, and loose dirt, and a more aggressive all-terrain or mud-terrain tread can add off-road grip. The tradeoff is that wider and heavier tires can reduce steering sharpness, add road noise, slightly reduce fuel economy, and place more demand on brakes, suspension, and gearing.
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285 Vs 265 Tires: What’s the Difference?
A 285 tire is 20 mm wider than a 265 tire. If both tires use the same aspect ratio and wheel diameter, the 285 will also be taller because the sidewall is calculated as a percentage of the width.
| Size | Approx. Width | Approx. Diameter | Ground-Clearance Change |
| 265/70R17 | About 10.4 in | About 31.6 in | Baseline |
| 285/70R17 | About 11.2 in | About 32.7 in | About +0.55 in |
Size and Width Difference
Moving from a 265/70R17 to a 285/70R17 gives you about 0.79 inch more nominal width and about 1.1 inches more overall diameter. That usually creates a stronger stance and a little more clearance under the axle, but it also increases the chance of rubbing.
Fitment and Performance
For daily driving, 265s are often lighter, easier to fit, and better for fuel economy. A 285 can offer more traction and flotation, especially in an all-terrain or mud-terrain pattern, but it may feel heavier and may require trimming, a leveling kit, a lift, or a different wheel offset.
Also check tire pressure after changing sizes. The pressure on your door placard was selected for the original tire size and load rating. A tire shop or tire manufacturer load-inflation chart can help you choose a safe pressure for a different load index or tire construction.
Which Trucks Fit 285 Tires Best?
Full-size trucks such as the Ford F-150, Chevrolet Silverado, Ram 1500, Toyota Tundra, and similar body-on-frame SUVs are common candidates for 285 tires, but fitment is never universal. The year, trim, suspension package, wheel offset, wheel width, and chosen tire model can change the answer.
A 285/70R17 is often easier to fit than a true 35-inch tire because it stays in the 33-inch class. Even so, some stock setups may rub at the mud flap, fender liner, upper control arm, sway bar, or body mount. On midsize trucks, 285s often require more careful wheel and suspension planning.
285 Tires or 35s?
A 285/70R17 is usually a 33-inch-class tire. A true 35, such as a 35×12.50R17, is usually much taller and wider. That extra size can improve breakover clearance and obstacle clearance off-road, but it also increases weight, rubbing risk, speedometer change, and gearing impact.
Choose 285s if you want a balanced upgrade that often keeps better daily drivability. Choose 35s if maximum clearance is the priority and you are ready for supporting changes such as lift height, trimming, wheel offset, gearing, and possibly brake or suspension upgrades.
Note: Load rating does not automatically increase just because a tire is larger. Always compare the actual load index, load range, and maximum load listed for the exact tire.
Common 285 Tire Fitment Mistakes
- Assuming all 285s are the same height: A 285/60R18 and a 285/75R17 are very different sizes.
- Ignoring wheel offset: The same tire can rub the control arm on one wheel and the fender on another.
- Using only online calculations: Calculators give nominal dimensions, not exact mounted measurements.
- Forgetting speedometer change: A taller tire travels farther per revolution, so the speedometer may read lower than actual speed.
- Overlooking load index: Replacements should match or exceed the vehicle’s required load capacity unless the vehicle or tire manufacturer provides different guidance.
- Skipping a test fit: Full-lock and compression checks catch rubbing that a parked measurement can miss.
Frequently Asked Questions
Is a 285 tire a 33 or 35?
A common 285/70R17 is closer to a 33 than a 35. It measures about 32.7 to 32.8 inches tall, so it is usually called a 33-inch-class tire. A true 35 is normally closer to 34.5 to 35 inches tall, depending on the tire model.
Is a 285 taller than a 265 tire?
Yes, if the aspect ratio and wheel diameter are the same. A 285/70R17 is about 1.1 inches taller than a 265/70R17 because the wider tire also has a taller 70-series sidewall.
Is a 285 a 31-inch tire?
Usually no. A 285/70R17 is about 32.7 inches tall, and a 285/75R16 is about 32.8 inches tall. Some lower-profile 285 sizes can be closer to 31 or 32 inches, so always check the full tire size, not just the 285 width.
What is a 285 tire comparable to?
A 285/70R17 is comparable to a 33-inch-class tire. In flotation-style terms, it is roughly similar to a 33×11.50R17, though actual measurements vary by brand and tread design.
Will 285 tires rub?
They can. Rubbing depends on the vehicle, wheel offset, wheel width, suspension height, alignment, and tire model. Check full steering lock, reverse, compression, mud flaps, fender liners, and suspension clearance before assuming they fit.
Do 285 tires affect the speedometer?
Yes, if they are taller than the original tire. A taller tire covers more distance per rotation, so your actual road speed can be higher than the speedometer shows. The larger the diameter change, the more noticeable the difference.
Conclusion
A 285 tire is about 11.2 inches wide, but its height depends on the full size code. The most common example, 285/70R17, is about 32.7 to 32.8 inches tall and fits into the 33-inch class. It is wider and taller than a 265/70R17, but it is not a true 35.
Before you commit, confirm the exact tire’s spec sheet, approved rim width, load index, speed rating, wheel offset, and vehicle clearance. When those details line up, 285s can give your truck a stronger stance, more traction, and a useful bump in clearance without jumping all the way to 35s.
Sources
- Tire Rack — How Do I Calculate Tire Dimensions? — tire-size formulas and warning that nominal dimensions can differ from actual tire measurements.
- Bridgestone Americas — Determining Tire Size — tire width, aspect ratio, rim diameter, load index, and speed rating explanations.
- Tire Industry Association — Reading a Tire Sidewall — sidewall markings, load index, speed symbol, and DOT code guidance.
- TireSize.com — 285/70R17 Tires — reference dimensions for 285/70R17 tires.
- Tire Rack — BFGoodrich All-Terrain T/A KO2 Specifications — example manufacturer-specific LT285/70R17 dimensions and rim-width range.
- Cooper Tire — Discoverer AT3 XLT Tire Specification — example LT285/70R17 dimensions, load data, and approved rim width.
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