How Wide Is a 285 Tire? Exact Width & Fitment Guide
A 285 tire has a nominal section width of 285 millimeters, which equals about 11.22 inches. That number tells you the tire’s sidewall-to-sidewall width on its measuring rim, not the tread width alone. For common truck and SUV sizes such as 285/70R17, the tire is also roughly 32.7 to 32.8 inches tall, depending on the exact tire model.
Quick Answer
A 285 tire is about 11.2 inches wide. In a size like 285/70R17, the 285 is the nominal width in millimeters, the 70 is the sidewall height as a percentage of that width, and the 17 is the wheel diameter in inches.
Key Takeaways
- A 285 tire is 285 mm wide, or about 11.22 inches, before brand-specific measurement differences.
- A 285/70R17 is about 32.7 inches tall, with a sidewall height near 7.85 inches.
- Many 285/70R17 tires use a rim-width range around 7.5 to 9.5 inches, but the tire manufacturer’s spec sheet is the final authority.
- A 285 is not automatically a 33-inch tire; overall diameter changes with aspect ratio and wheel size.
- Before buying, check wheel width, offset, suspension clearance, full steering lock, load rating, and speedometer impact.
At a Glance
| Time Required | 10 to 20 minutes for a basic fitment check |
| Difficulty | Easy for measurements; moderate if checking suspension compression |
| Tools Needed | Tape measure, flashlight, wheel/tire spec sheet, and vehicle tire placard or owner’s manual |
| Cost | Free if measuring yourself; professional test fitting or alignment costs vary by shop |
How Wide Is a 285 Tire?
A 285 tire is nominally 285 millimeters wide. Converted to inches, that is 11.22 inches. In metric tire sizing, the first number represents nominal section width, which is measured from sidewall to sidewall on a specified measuring rim. Michelin explains that this first number is the tire’s nominal section width in millimeters, while the aspect ratio is the sidewall height as a percentage of that width: Michelin tire markings guide.
That does not mean every 285 tire measures exactly 11.22 inches when mounted. Actual section width can vary by tire model, tread design, load range, and measuring rim. For example, one BFGoodrich All-Terrain T/A KO3 in LT285/70R17 is listed with an 11.5-inch section width on an 8.5-inch measuring rim, which shows why published specs matter: Tire Rack BFGoodrich KO3 LT285/70R17 specs.
Note: Tire width and tread width are not the same thing. The 285 number describes nominal section width from sidewall to sidewall, while tread width is the part of the tire pattern that contacts the road.
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285 Tire Width in Inches and Mm
The simple conversion is:
285 mm ÷ 25.4 = 11.22 inches
So a 285 tire is just over 11 inches wide. This is wider than many stock passenger and light-truck tires, which can give the vehicle a broader stance and a larger contact patch. The tradeoff is that the extra width can also create rubbing at the fender liner, control arm, mud flap, or inner wheel well if the wheel offset and suspension setup do not match the tire.
285 Width In Inches
A 285 tire is about 11.22 inches wide by nominal metric conversion. Mounted width may be slightly different. Some 285/70R17 tires measure closer to 11.2 inches, while others list about 11.5 inches because the section width changes with construction and measuring rim.
285 Width In Millimeters
The “285” in a tire size such as 285/70R17 means the tire’s nominal section width is 285 millimeters. The “70” means the sidewall height is 70% of 285 mm. The “R” means radial construction. The “17” means the tire fits a 17-inch wheel.
Fitment And Wheel Width
A 285 tire needs a wheel that supports the tire’s bead and sidewall shape correctly. Many 285/70R17 tires are approved for wheels in the 7.5- to 9.5-inch range, but this is not universal. Always check the tire manufacturer’s spec sheet for your exact tire model and load range.
Warning: Do not choose a tire only because the width looks right. Confirm wheel width, load index, speed rating, tire pressure requirements, and vehicle clearance before installing. When in doubt, use the vehicle tire placard, owner’s manual, or a qualified tire dealer.
How to Calculate 285/70R17 in Inches
A common 285 size is 285/70R17. Here is the math:
- Width: 285 mm ÷ 25.4 = 11.22 inches
- Sidewall height: 285 mm × 0.70 = 199.5 mm, or about 7.85 inches
- Overall diameter: 17 inches + 7.85 inches + 7.85 inches = about 32.7 inches
That is why a 285/70R17 is often treated as a “near-33-inch” tire, but it is not exactly the same as every tire labeled 33 inches.
What Vehicles Use 285 Tires?
285 tires are common on trucks, SUVs, Jeeps, and off-road builds that need more width, traction, and sidewall than many factory tire sizes provide. You may see 285 tires used as original equipment on some trims, but they are more often discussed as upgrades for vehicles such as the Ford F-150, Chevrolet Silverado 1500, Jeep Wrangler, Toyota 4Runner, Toyota Tundra, Nissan Titan, Ram trucks, and similar 4×4 platforms.
Fitment is not guaranteed just because another owner runs the same width. Year, trim, wheel width, wheel offset, suspension height, alignment, fender liner shape, and bumper design can all change the result.
Will a 285 Tire Fit Your Wheel?
A 285 tire may fit your wheel if the wheel diameter and rim width match the tire’s approved range. For a 285/70R17, the wheel diameter must be 17 inches. The rim width is usually around 7.5 to 9.5 inches for many common models, but the exact approved range depends on the tire.
Use this checklist before buying:
- Wheel diameter: Match the R-size, such as 17 inches for 285/70R17.
- Rim width: Confirm the approved rim-width range on the tire spec sheet.
- Offset/backspacing: Make sure the tire clears the control arm, frame, and fender liner.
- Steering lock: Turn fully left and right and check for rubbing points.
- Suspension travel: Check clearance under compression, not only at parked ride height.
- Load and speed rating: Match or exceed the vehicle’s requirements.
- Spare tire space: A larger 285 may not fit in the factory spare location.
- Speedometer and gearing: Taller tires can change indicated speed and effective gearing.
Pro Tip: If you are close on clearance, test fit one front tire first. Front tires are more likely to rub because they steer and move through suspension travel.
285 Tire Fitment on 17-Inch Rims
A 285/70R17 is one of the most common 285 tire sizes for trucks and SUVs. It fits a 17-inch wheel and measures roughly 32.7 to 32.8 inches tall depending on the model. Many 285/70R17 tires work on rim widths around 7.5 to 9.5 inches, but you should verify the exact tire’s published range.
17-Inch Rim Fitment
With 17-inch wheels, a 285/70R17 gives you a tall sidewall and a strong off-road look without going as wide as a 12.50-inch tire. This size is popular because it gives useful sidewall height for rough roads and trails while still fitting many truck and SUV platforms with minor or no modifications, depending on the vehicle.
Stock Wheel Width Range
Many factory 17-inch truck wheels are 7.5 to 8.5 inches wide, which can work for several 285/70R17 tires. However, the tire spec sheet decides the safe range. A wheel that is too narrow can pinch the sidewalls, while a wheel that is too wide can reduce bead protection and change the tire profile.
285 Tire Fitment on 18-, 20-, and 21-Inch Rims
A 285 tire can fit 18-, 20-, and 21-inch wheels only when the tire’s rim diameter matches the wheel. For example, a 285/65R18 fits an 18-inch wheel, a 285/60R20 fits a 20-inch wheel, and a 285/45R21 fits a 21-inch wheel.
The important point is that rim diameter alone does not tell you the tire’s total height. The aspect ratio controls sidewall height. A 285/70R17 is about 32.7 inches tall, but a 285/45R21 is much shorter in sidewall even though it uses a larger wheel.
| Example Size | Approx. Diameter | Best Use |
| 285/70R17 | About 32.7 inches | Common truck/SUV off-road fitment |
| 285/65R18 | About 32.6 inches | Similar height on 18-inch wheels |
| 285/60R20 | About 33.5 inches | Larger-wheel truck stance |
| 285/45R21 | About 31.1 inches | Street/SUV performance fitments |
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285 Tire Width Vs 33X12.50 Tires
A 285/70R17 is about 11.2 inches wide by nominal conversion and about 32.7 inches tall. A 33×12.50R17 is a high-flotation size: the first number is the approximate overall diameter, the second number is the nominal section width, and the last number is the wheel diameter. Goodyear explains high-flotation tire sizing in this order: overall diameter, section width, and rim diameter: Goodyear tire size chart.
That means a 33×12.50R17 is usually wider than a 285/70R17 by about 1.3 inches. The 33×12.50 may offer a more aggressive footprint, but it often needs more wheel width, more clearance, and more careful offset selection.
How 285 Tires Affect Clearance
A 285 tire mainly affects side clearance because it is wider. It may rub the fender liner, mud flap, body mount, control arm, sway bar, or frame depending on wheel offset and suspension design. Ground clearance changes mainly when the tire’s overall diameter changes, not simply because the tire is wider.
| Clearance Factor | What to Check |
| Wheel well space | Look for liner, fender, bumper, and mud-flap contact. |
| Full steering lock | Turn fully left and right and inspect the inner and outer edges. |
| Suspension compression | Check clearance when the suspension moves, not only while parked. |
| Wheel offset | Too much inward or outward movement can create different rubbing points. |
| Tire diameter | Taller tires affect ground clearance, speedometer readings, and gearing. |
Best 285 Tire Sizes for Stock Rigs
The best 285 size for a stock vehicle depends on the original tire size and available clearance. For many trucks and SUVs, 285/70R17 is the best-known 285 upgrade because it stays near 33 inches tall without being as wide as a 12.50-inch tire. Other common 285 sizes include 285/75R16, 285/65R18, 285/60R20, and 285/55R20.
Do not assume that a nearby size such as 275/70R17 or 295/70R17 fits the same way. A 275 is narrower, while a 295 is wider and may be taller depending on aspect ratio. Small changes can still affect rubbing, gearing, braking feel, and speedometer accuracy.
Safety Check Before Buying 285 Tires
Before switching to 285 tires, compare the new size with your vehicle’s original tire size and the manufacturer’s approved alternatives. The National Highway Traffic Safety Administration advises choosing the same size as the vehicle’s original tires or another size recommended by the vehicle manufacturer, and consulting a tire dealer if you are unsure: NHTSA TireWise.
- Match or exceed the original load index.
- Match or exceed the original speed rating, unless the tire manufacturer and vehicle use case allow otherwise.
- Use the vehicle placard for recommended cold inflation pressure unless a qualified tire professional advises otherwise for the new setup.
- Recheck torque, pressure, and rubbing after installation.
- Get an alignment if the tire change is paired with suspension work or if steering feel changes.
Frequently Asked Questions
Is a 285 the same as a 33-inch tire?
Not always. A 285 only tells you the nominal width in millimeters. A 285/70R17 is about 32.7 inches tall, so it is close to a 33-inch tire, but other 285 sizes can be shorter or taller depending on aspect ratio and wheel diameter.
How wide is a 285 tire in inches?
A 285 tire is about 11.22 inches wide by nominal conversion. The actual mounted section width may be slightly different depending on brand, model, load range, and rim width.
Is a 285 wider than a 265?
Yes. A 285 is 20 mm wider than a 265. In inches, that is about 0.79 inch wider. The extra width can improve stance and traction, but it can also increase the chance of rubbing.
Is a 285 a 31-inch tire?
Not by itself. The 285 number is width, not height. A 285/70R17 is about 32.7 inches tall, while a 285/45R21 is about 31.1 inches tall. You need the full tire size to know the diameter.
Will 285 tires rub?
They can. Rubbing depends on vehicle model, trim, wheel width, offset, suspension height, tire diameter, and tread design. Check clearance at full steering lock and under suspension compression before assuming the fit is safe.
What rim width is best for a 285 tire?
Many 285/70R17 tires use approved rim widths around 7.5 to 9.5 inches, but the correct range depends on the exact tire. Always use the manufacturer’s published specification for your tire model.
Conclusion
A 285 tire is about 11.2 inches wide, but width is only one part of fitment. For a common size like 285/70R17, you also get an overall diameter near 32.7 inches, which can affect clearance, speedometer readings, and gearing. The safest move is to verify the tire’s approved rim width, compare the full size against your factory tire, and check real clearance at full lock and suspension travel before you buy.
Sources
- Michelin — Tire Markings Explained — supports tire-width, aspect-ratio, construction, wheel-diameter, load, and speed-rating explanations.
- Tire Rack — BFGoodrich All-Terrain T/A KO3 LT285/70R17 Specs — supports manufacturer-style examples for rim width range, measured rim width, section width, and overall diameter.
- Goodyear — Tire Size Chart — supports standard and high-flotation tire-size format explanations.
- NHTSA TireWise — supports tire safety guidance, tire ratings, and choosing appropriate tire sizes.
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