A 285/70R17 tire is about 32.7 inches tall, 11.2 inches wide, and has a sidewall height of about 7.85 inches. It fits a 17-inch wheel and is often treated as a near-33-inch tire, but it is not exactly the same size as a 33×12.50R17. Before you mount one, check your wheel width, load rating, speed rating, clearance, and vehicle placard.
Quick Answer
A 285/70R17 tire is about 32.7 inches tall, 11.2 inches wide, and has a 7.9-inch sidewall on a 17-inch wheel. It is close to a 33-inch tire, but usually slightly shorter and narrower than a 33×12.50R17. Always confirm rim width, load rating, and vehicle clearance before mounting.
Key Takeaways
- A 285/70R17 tire is roughly 32.7 inches tall overall.
- Its section width is about 11.2 inches, or 285 mm.
- The sidewall height is about 7.85 inches, based on the 70% aspect ratio.
- It fits a 17-inch wheel; many LT versions list an approved rim-width range around 7.5 to 9 inches.
- It is close to a 33-inch tire, but a 33×12.50R17 is normally wider and may be slightly taller depending on the tire model.
What Is a 285/70R17 Tire?
A 285/70R17 tire is a radial tire size made for a 17-inch wheel. The size code tells you the tire’s nominal section width, sidewall ratio, construction, and wheel diameter. In this size, 285 means the tire is about 285 mm wide, 70 means the sidewall height is 70% of that width, R means radial construction, and 17 means it fits a 17-inch wheel. That is the same basic sidewall-marking system explained by Michelin’s tire marking guide.
In practical terms, the 285/70R17 is common on trucks, SUVs, Jeeps, and overland builds because it gives a taller sidewall, a wider footprint, and a near-33-inch stance without jumping to a much wider flotation size. Exact measured dimensions can still vary by tire brand, tread design, load range, inflation pressure, and measuring rim width, so always check the specific tire manufacturer’s spec sheet before buying.
285/70R17 Tire Size in Inches
The easiest way to understand this size is to convert the metric parts into inches. A 285 mm section width equals about 11.22 inches. The 70% aspect ratio gives a sidewall height of 199.5 mm, or about 7.85 inches. Add two sidewalls to the 17-inch wheel diameter, and the total tire height comes out to about 32.7 inches.
| Spec | 285/70R17 Value |
|---|---|
| Overall diameter | About 32.7 inches |
| Section width | About 11.2 inches / 285 mm |
| Sidewall height | About 7.85 inches |
| Wheel diameter | 17 inches |
| Circumference | About 102.7 inches |
| Revolutions per mile | About 617 |
Note: These are nominal size calculations. Real-world measured diameter and width can vary slightly by brand, model, tread depth, load range, inflation pressure, and rim width.
How To Calculate 285/70R17 Tire Height
You can calculate the height of a 285/70R17 tire with a simple formula:
- Section width: 285 mm ÷ 25.4 = 11.22 inches
- Sidewall height: 285 mm × 0.70 = 199.5 mm ÷ 25.4 = 7.85 inches
- Overall diameter: 7.85 inches × 2 + 17 inches = 32.7 inches
- Circumference: 32.7 inches × 3.1416 = about 102.7 inches
- Revolutions per mile: 63,360 inches ÷ 102.7 inches = about 617 revs per mile
This is why a 285/70R17 is often grouped with 33-inch tires in casual conversation. It is close, but the math shows it lands just under 33 inches before you account for brand-specific measurement differences.
How Wide Is a 285/70R17 Tire, and What Wheels Fit?
A 285/70R17 tire is about 11.2 inches wide. It mounts on a 17-inch wheel, but the correct wheel width depends on the specific tire. Many LT285/70R17 tires list an approved rim-width range around 7.5 to 9 inches, while some non-LT or P-metric versions may allow a slightly wider range. TireSize.com lists 285/70R17 dimensions and notes that wheel-width specs can vary by manufacturer, so the exact tire’s spec sheet should be the final reference.
Staying inside the approved rim range matters because rim width changes the tire’s shape. A wheel that is too narrow can pinch the sidewalls inward. A wheel that is too wide can flatten the tread profile and expose the sidewall. Either mismatch can affect handling, bead seating, tread wear, and clearance.
Warning: Do not choose tires by diameter alone. Use the vehicle tire placard, owner’s manual, wheel manufacturer specs, and tire manufacturer specs. NHTSA advises choosing the original tire size or another size recommended by the manufacturer, and consulting a tire dealer if you are unsure.
Is a 285/70R17 the Same as a 33-Inch Tire?
No. A 285/70R17 is close to a 33-inch tire, but it is not exactly the same. A 285/70R17 is about 32.7 inches tall and 11.2 inches wide. A 33×12.50R17 is a flotation-size tire where the label generally means about 33 inches tall, 12.50 inches wide, and made for a 17-inch wheel.
The important difference is width. A 33×12.50R17 is usually about 1.3 inches wider than a 285/70R17. That extra width can change clearance at the fenders, control arms, sway bar, body mounts, and inner liner. It can also require different wheel offset or more trimming, depending on the vehicle.
285/70R17 vs 33×12.50R17 Comparison
| Spec | 285/70R17 | 33×12.50R17 |
|---|---|---|
| Overall diameter | About 32.7 inches | About 33 inches nominal |
| Width | About 11.2 inches | About 12.5 inches nominal |
| Sidewall height | About 7.85 inches | About 8 inches nominal |
| Circumference | About 102.7 inches | About 103.7 inches nominal |
| Best takeaway | Near-33 height with less width | Wider stance and more clearance concerns |
If your main goal is a near-33-inch tire without the extra width of a 12.50-inch flotation tire, 285/70R17 is often the cleaner fit. If your goal is a wider footprint and aggressive stance, 33×12.50R17 may be the better match, but it is more likely to require clearance work.
285/70R17 vs 33×12.50R17: What’s the Difference?
The 285/70R17 and 33×12.50R17 are close in height but different in shape. The 285/70R17 is narrower, which can make it easier to fit on many factory-style wheels. It may also be less likely to rub at full steering lock than a 12.50-inch-wide tire. The 33×12.50R17 gives a wider footprint and bolder stance, but that width can create more fitment issues.
For daily driving, towing, and mixed road use, the narrower 285/70R17 can feel more predictable and may track better in rain or ruts. For soft terrain, sand, and off-road setups where width is helpful, a 33×12.50R17 may make sense if your wheels, suspension, and fenders can support it.
Pro Tip: If you are choosing between 285/70R17 and 33×12.50R17, test clearance at full steering lock and under suspension compression. Static parking-lot clearance is not enough because tires move closer to liners, mounts, and fenders when the suspension cycles.
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The SAFELIFE dial tire tread depth gauge measures tread depth in 1/32 inch increments with clear, easy-to-read 2-inch dial face. Color zones using a traffic light system help you quickly judge whether tread is low, marginal, or ample for safer driving. Built with a durable zinc cast body and a metal detect probe for precise, comfortable use across cars, motorcycles, trucks, and buses.
Best Equivalent Tire Sizes for 285/70R17
The best equivalent size depends on whether you want to preserve height, width, wheel diameter, or factory drivability. As a general rule, staying within about 3% of the original tire diameter helps reduce speedometer, gearing, and clearance surprises. The closer the diameter and width are to your current setup, the easier the swap usually is.
| Tire Size | Approx. Diameter | Approx. Width | Difference vs 285/70R17 |
|---|---|---|---|
| 285/70R17 | 32.7 in | 11.2 in | Baseline |
| 305/65R17 | 32.6 in | 12.0 in | Very close height, wider |
| 33×10.50R17 | 33.0 in nominal | 10.5 in nominal | Slightly taller, narrower |
| 295/70R17 | 33.3 in | 11.6 in | Taller and slightly wider |
| 275/70R17 | 32.2 in | 10.8 in | Slightly shorter and narrower |
| 255/80R17 | 33.1 in | 10.0 in | Taller, much narrower |
The closest height match in this group is often 305/65R17, but it is wider. The 275/70R17 is a useful step down if you want a similar 17-inch truck tire with less height and width. Always compare the actual tire model, not just the size label, because two tires with the same size can have different measured diameters and tread widths.
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How 285/70R17 Tires Affect Speedometer and MPG
A 285/70R17 tire can affect your speedometer if it is taller or shorter than the tire your vehicle was calibrated for. The direction is simple: if the new tire is taller than the original tire, your actual speed is higher than the speedometer shows. If the new tire is shorter, your actual speed is lower than the speedometer shows. Discount Tire explains that tire size and speedometer accuracy are directly linked because tire circumference changes how far the vehicle travels per tire revolution.
Use this formula:
Actual speed = indicated speed × new tire diameter ÷ original tire diameter
| Original Size Example | Approx. Original Diameter | With 285/70R17 at 60 mph Indicated |
|---|---|---|
| 265/70R17 | 31.6 in | About 62.1 mph actual |
| 265/65R17 | 30.6 in | About 64.2 mph actual |
| 255/75R17 | 32.1 in | About 61.2 mph actual |
Fuel economy can also change, but there is no single percentage that applies to every vehicle. A larger tire can add weight, change effective gearing, and increase rolling resistance, especially with aggressive all-terrain or mud-terrain tread. To estimate the impact, compare the new tire’s weight, tread pattern, load range, and rolling-resistance information against your current tire.
How To Choose the Right 285/70R17 Tire for Your Vehicle
To choose the right 285/70R17 tire, start with your vehicle’s tire placard and owner’s manual. Michelin notes that the vehicle placard and owner’s manual identify the manufacturer’s recommended tire size and inflation pressure, while NHTSA’s tire safety guidance says to choose the original tire size or another size recommended by the manufacturer.
| Check | Why It Matters |
|---|---|
| Wheel diameter | The tire must mount on a 17-inch wheel. |
| Rim width | The wheel must fall inside the tire manufacturer’s approved rim-width range. |
| Load index / load range | The tire must meet or exceed the vehicle’s load requirement. |
| Speed rating | The rating must match the vehicle’s use and manufacturer requirements. |
| Wheel offset and backspacing | These affect inner and outer clearance more than tire diameter alone. |
| Full-lock clearance | Check for rubbing at the liner, frame, body mount, sway bar, and upper control arm. |
| Spare tire fit | A larger tire may not fit in the factory spare location. |
| Speedometer / TPMS | A size change may require recalibration or pressure-threshold review. |
Prioritize safety before stance. The right 285/70R17 tire should meet the vehicle’s load needs, fit the wheel correctly, clear the body and suspension, and support your driving conditions. For towing, heavy payloads, or frequent off-road use, check the tire’s load range, heat rating, tread depth, sidewall construction, and warranty details before choosing.
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Frequently Asked Questions
Are 285/70R17 tires the same as 33-inch tires?
No. A 285/70R17 is about 32.7 inches tall, so it is close to a 33-inch tire but not exact. It is also about 11.2 inches wide, while a 33×12.50R17 is usually about 12.5 inches wide.
What is the actual height of a 285/70R17?
The calculated height is about 32.7 inches. Actual measured height can vary slightly by tire brand, model, tread design, inflation pressure, and wheel width.
How much taller is a 35-inch tire than a 285/70R17?
A 35-inch tire is about 2.3 inches taller overall than a 285/70R17. That means the axle usually sits about 1.15 inches higher, before real-world tire measurement differences.
Is a 285/70R17 taller than a 265/70R17?
Yes. A 285/70R17 is about 32.7 inches tall, while a 265/70R17 is about 31.6 inches tall. The 285/70R17 is also wider, so check clearance before switching.
Will 285/70R17 tires fit stock wheels?
They may fit some stock 17-inch wheels, but only if the wheel width is approved for that specific tire. Check the tire manufacturer’s rim-width range and confirm vehicle clearance at full steering lock.
Do I need a lift for 285/70R17 tires?
It depends on the vehicle, wheel offset, tire model, and suspension setup. Some trucks and SUVs fit 285/70R17 tires with little or no modification, while others need trimming, different wheels, a leveling kit, or a lift.
Conclusion
A 285/70R17 tire is a practical near-33-inch size: about 32.7 inches tall, 11.2 inches wide, and built for a 17-inch wheel. It gives a taller sidewall and more ground clearance than many factory truck and SUV sizes, but it is not automatically interchangeable with every 33-inch tire. Before buying, confirm the tire’s actual specs, approved rim width, load rating, speed rating, wheel offset, and vehicle clearance. That final fitment check is what keeps the upgrade useful, safe, and predictable.
Sources
- Michelin — Tire Markings Explained — backs up tire width, aspect ratio, radial construction, wheel diameter, load rating, and speed rating explanations.
- Michelin — Choosing the Right Tire Size for Your Vehicle — backs up using the vehicle placard, owner’s manual, and manufacturer specifications.
- NHTSA — Tire Safety Brochure — backs up safety guidance for choosing the original or manufacturer-recommended tire size.
- NHTSA TireWise — Tire Safety Ratings and Awareness — backs up tire rating and UTQG context.
- TireSize.com — 285/70R17 Tires — backs up nominal 285/70R17 dimensions, circumference, revolutions per mile, and common rim-width ranges.
- Discount Tire — Tire Size and Speedometer Accuracy — backs up how tire-height changes affect speedometer readings and recalibration needs.
