Tire Basics By Carter Hayes June 24, 2026 8 min read

What Inch Tire Is a 285? Size Conversion & Explained

A 285 tire is about 11.22 inches wide, because 285 millimeters divided by 25.4 equals 11.22 inches. That number tells you the tire’s nominal section width, not the full tire height. To know how tall the tire is, you also need the aspect ratio and wheel diameter, such as 285/70R17.

Quick Answer

A 285 tire is about 11.22 inches wide. A common 285/70R17 tire is about 32.7 inches tall, so it is often treated as a near-33-inch tire. It is not always a 33-inch tire, because tire height changes with aspect ratio and wheel size.

Key Takeaways

A 285 tire is 285 mm wide, or about 11.22 inches.
Width alone does not tell you tire height. You need the full size, such as 285/70R17.
A 285/70R17 tire has a theoretical diameter of about 32.71 inches.
A 285/70R17 is close to a 33-inch tire, but it is not the same as every 33-inch flotation size.
Always confirm rim width, load rating, clearance, and the tire size listed in your owner’s manual or door placard.

At a Glance

Time Required	2 to 5 minutes to calculate size; longer if checking vehicle clearance
Difficulty	Easy for basic math; moderate for real-world fitment
Tools Needed	Calculator, tape measure for clearance, vehicle owner’s manual, tire spec sheet
Cost	Free to calculate; tire cost depends on brand, load range, tread, and size

What Does a 285 Tire Mean?

Tire width and sidewall specifications for a 285 tire

A 285 tire means the tire has a nominal section width of 285 millimeters. Section width is the sidewall-to-sidewall width of an inflated tire when mounted on its approved measuring rim. In inches, 285 mm is about 11.22 inches.

In a size like 285/70R17, each part has a job:

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.

That full code matters because a 285 tire can be short, tall, mild, or aggressive depending on the sidewall ratio and wheel size. A 285/70R17 is near 33 inches tall, while a 285/45R22 would be much shorter overall. Selecting the right full size can also affect ride comfort and fuel economy.

Note: The 285 number is not tread width. Tread width is the part of the tire pattern that touches the road, and it can be narrower than the section width.

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How Wide Is a 285 Tire in Inches?

A 285 tire is about 11.22 inches wide.

Here is the simple conversion:

285 mm ÷ 25.4 = 11.22 inches

This gives you a useful number when comparing metric tire sizes to inch-based tire sizes. It also helps you check wheel width, fender clearance, and suspension clearance before buying. A wider tire may provide a more planted feel, but grip depends on tread design, rubber compound, tire pressure, load, and road surface, not width alone.

In practical terms, a 285 tire is a wide light-truck or SUV tire size. It can work well for drivers who want more stance, traction, or off-road sidewall than a narrower tire. Still, you should compare the full size, not only the width, when choosing year-round tire performance.

How Tall Is a 285/70R17 Tire?

A 285/70R17 tire is about 32.71 inches tall in theoretical diameter. Many people round that to 32.7 inches or call it a near-33-inch tire.

Here is the formula:

Sidewall height: 285 mm × 0.70 = 199.5 mm
Sidewall in inches: 199.5 ÷ 25.4 = 7.85 inches
Overall diameter: 17 + 7.85 + 7.85 = 32.71 inches
Circumference: 32.71 × 3.1416 = about 102.76 inches
Revolutions per mile: 63,360 ÷ 102.76 = about 616.6 revs per mile

That height can improve ground clearance compared with smaller stock tires, but it can also affect gearing, acceleration, braking feel, and speedometer readings. Tire construction, tread depth, and load range can also influence the final measured diameter, so compare the tire maker’s published specs before buying. The tread life and overall performance of the tire will also matter for long-term value.

Is a 285 Tire the Same as 33 Inches?

285 tire compared with a 33 inch tire size

Not always. A 285 tire is not automatically a 33-inch tire. The 285 only tells you width. The height depends on the aspect ratio and wheel diameter.

A 285/70R17 is close to 33 inches because its calculated diameter is about 32.71 inches. That is why many owners call it a “33-inch class” tire. A 285/75R17, however, is taller at about 33.83 inches. A 285/60R18 is shorter at about 31.46 inches.

Warning: Do not buy tires based only on the phrase “33-inch tire.” Check the full tire size, load rating, approved rim width, vehicle placard, and available clearance. A small diameter or width change can still cause rubbing or change how the vehicle drives.

How Does 285/70R17 Compare to 33×12.50R17?

A 285/70R17 and a 33×12.50R17 are close in height but different in width. The 285/70R17 is about 32.71 inches tall and 11.22 inches wide by its metric code. A 33×12.50R17 is a flotation size that is nominally about 33 inches tall and 12.50 inches wide.

The difference matters most around the fenders, upper control arms, wheel offset, mud flaps, and bumper edges. The 33×12.50R17 is usually wider, so it may need more trimming, different wheel offset, or more careful fitment checks.

Spec	285/70R17	33×12.50R17
Sizing system	Metric	Flotation
Approx. diameter	32.71 in	About 33.0 in nominal
Approx. width	11.22 in nominal section width	12.50 in nominal section width
Fitment impact	Usually easier to fit	More likely to rub due to width

Also compare load index, load range, tread depth, and UTQG where listed. Understanding UTQG ratings can help you compare treadwear, traction, and temperature grades on passenger-vehicle tires.

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What Are the Best 17-Inch Alternatives to a 285 Tire?

If you like the size of a 285/70R17 but want another 17-inch option, compare both diameter and width. Staying close in diameter helps reduce speedometer error and driveline change, while width affects rubbing and steering clearance.

Size	Approx. Diameter	Approx. Width	Best For
275/70R17	32.16 in	10.83 in	Slightly narrower fit with less rubbing risk
285/70R17	32.71 in	11.22 in	Balanced near-33-inch setup
305/65R17	32.61 in	12.01 in	Similar height with more width
295/70R17	33.26 in	11.61 in	Slightly taller and wider stance
285/75R17	33.83 in	11.22 in	More height without adding width
33×12.50R17	About 33.0 in nominal	12.50 in nominal	Wide flotation-style look

To keep speedometer error and drivetrain changes modest, compare the new diameter against your original tire diameter. A common shopping rule is to stay close to the factory diameter unless your vehicle is built for the change. Still, that rule does not replace the owner’s manual, tire placard, or tire maker’s specs. You should also consider tread design for the surfaces you drive most.

Closest 17-Inch Matches

The closest diameter match to a 285/70R17 among common 17-inch alternatives is often 305/65R17, at about 32.61 inches tall. It is nearly the same height but wider. If you want less width, 275/70R17 is smaller and easier to fit. If you want more height, 295/70R17 or 285/75R17 moves you upward.

Closest height: 305/65R17
Same width but taller: 285/75R17
Wider and slightly taller: 295/70R17
Wider flotation style: 33×12.50R17

Width And Diameter Tradeoffs

Width and diameter change different parts of the driving experience. More diameter can raise ground clearance, but it can also make the vehicle feel slower off the line. More width can add stance and sidewall presence, but it can also rub sooner during turns or suspension compression.

Change	Possible Benefit	Possible Tradeoff
Taller diameter	More ground clearance and tire sidewall	Speedometer change, slower gearing, more rubbing risk
Wider section width	More stance and a wider footprint	More clearance problems near fenders and suspension
Heavier tire	Often stronger construction	More unsprung weight and possible fuel economy loss

Pro Tip: Before buying a wider tire, turn your current front tires fully left and right and inspect the tightest areas. Check the fender liner, mud flap, upper control arm, sway bar, and bumper edge.

How Do You Choose the Right 285 Tire Size?

Choosing the right 285 tire size starts with your vehicle, not the tire catalog. Check the tire size on the driver’s door Tire and Loading Information Label, then compare it with your owner’s manual and the tire manufacturer’s spec sheet. If your vehicle came with a much smaller tire, a 285 may need trimming, a lift, different wheels, or recalibration.

Use this checklist before you buy:

Confirm the full size: 285/70R17, 285/75R17, and 285/65R18 are not the same height.
Check approved rim width: Many LT285/70R17 tires list approved rim widths around 7.5 to 9 inches, but always verify the exact tire model.
Match load rating: Do not downgrade load index or load range from what your vehicle needs.
Check speed rating: Make sure the tire rating fits your driving use.
Measure clearance: Check inner and outer clearance at full steering lock and during suspension compression.
Consider wheel offset: Offset can decide whether a 285 clears or rubs.
Check spare tire fit: A taller 285 may not fit in the factory spare location.
Plan for speedometer change: Taller tires rotate fewer times per mile, so the speedometer may read lower than your true speed.

The best tire is not just the largest one that fits. It should match your load needs, terrain, clearance, braking expectations, and daily driving comfort. If you drive off-road often, the performance of all-terrain tires may matter more than the final half-inch of diameter.

Frequently Asked Questions

Is a 285 tire a 33 or 35?

A 285/70R17 tire is closer to a 33 than a 35. It is about 32.71 inches tall. A 35-inch tire is much taller and usually needs more clearance, gearing consideration, and fitment work.

Is a 285 close to a 33?

Yes, a 285/70R17 is close to a 33-inch tire because it is about 32.7 inches tall. It is still slightly under 33 inches by the standard formula, and real measurements can vary by tire model.

Is a 285 a 31 inch tire?

Not usually, but it depends on the full size. The 285 number only means the tire is about 11.22 inches wide. A 285/70R17 is about 32.7 inches tall, while a lower-profile 285 on a different wheel could be shorter.

Which tire is taller, 285 or 295?

If the aspect ratio and wheel diameter are the same, the 295 is taller and wider. For example, a 285/70R17 is about 32.71 inches tall, while a 295/70R17 is about 33.26 inches tall.

How many inches wide is a 285 tire?

A 285 tire is about 11.22 inches wide. The math is 285 divided by 25.4. That is nominal section width, not always the tread width that touches the road.

Will 285 tires rub?

They can rub on some vehicles, especially if the tire is taller than stock or mounted on wheels with aggressive offset. Check the fender liner, mud flaps, control arms, bumper, and full-lock steering clearance before buying.

Conclusion

A 285 tire is about 11.22 inches wide, but that number is only the starting point. For a common 285/70R17, the tire is about 32.7 inches tall, which places it close to a 33-inch tire. It is not automatically a true 33-inch tire, and it is not close to a 35-inch tire.

Before you buy, compare the full tire size, not just the 285 width. Check diameter, rim width, load rating, speed rating, clearance, wheel offset, spare tire space, and your vehicle’s tire placard. That extra check helps you get the stance and traction you want without rubbing, speedometer problems, or unsafe fitment.

Sources

Tire Rack – How Do I Read My Tire Size On My Sidewall? – supports section width, aspect ratio, radial construction, and wheel diameter definitions.
NHTSA TireWise – supports tire safety, correct tire size checks, tire pressure guidance, and tire maintenance cautions.
NHTSA Tire Buyers’ FAQ – supports checking the owner’s manual or Tire and Loading Information Label before buying tires.
NHTSA Congratulations on Your New Tire Purchase – supports tire registration, manufacture date, pressure, rotation, and recall-alert guidance.

Carter Hayes

Author

Carter Hayes is the founder and lead automotive editor of TubeTyre, an online resource focused on tyre reviews, buying guides, and practical automotive maintenance. With more than ten years of experience in the automotive field, Carter guides the site’s editorial strategy and review process. His work centers on making tyre and vehicle-care information easier for everyday drivers to understand, while maintaining a strong focus on testing standards and editorial trust.