How Wide Is a 285 70 R17 Tire? Exact Width & Fitment Guide
A 285/70R17 tire has a calculated section width of about 11.2 inches and a calculated overall diameter of about 32.7 inches. That makes it very close to a 33-inch tire, but not always the same as a true 33×12.50R17. For fitment, you need a 17-inch wheel, the right approved rim width, enough clearance, and a load rating that matches your vehicle.
Quick Answer
A 285/70R17 tire is about 11.22 inches wide and 32.71 inches tall by size calculation. It fits a 17-inch wheel and is commonly used on trucks, SUVs, and off-road builds. Most models need about a 7.5- to 9.0-inch or 7.5- to 9.5-inch approved rim range, depending on the tire.
Key Takeaways
- A 285/70R17 tire has a nominal section width of 285 mm, which equals about 11.22 inches.
- The calculated overall diameter is about 32.71 inches, so many drivers treat it as a near-33-inch tire.
- Actual diameter and width vary by brand, tread design, load range, and measuring rim.
- A 17-inch wheel is required, but the approved rim-width range depends on the exact tire model.
- Speedometer error depends on the size you replace, not the 285/70R17 size alone.
How to Calculate 285/70R17 Tire Size
The numbers in 285/70R17 tell you the tire’s nominal section width, aspect ratio, construction type, and wheel diameter. The first number, 285, is the tire’s section width in millimeters. The Tire Industry Association explains that this width is measured from sidewall to sidewall, not tread edge to tread edge. Tire Industry Association
The second number, 70, is the aspect ratio. That means the sidewall height is 70% of the tire’s section width. The R means radial construction, and 17 means the tire mounts on a 17-inch wheel. Bridgestone gives the same basic tire-size breakdown for width, aspect ratio, construction, and rim diameter. Bridgestone Americas
Size at a Glance
| Nominal section width | 285 mm, or about 11.22 inches |
| Aspect ratio | 70% of section width |
| Calculated sidewall height | 199.5 mm, or about 7.85 inches |
| Wheel diameter | 17 inches |
| Calculated overall diameter | About 32.71 inches |
| Calculated circumference | About 102.76 inches |
| Calculated revolutions per mile | About 617 revolutions per mile |
Use these numbers as a planning baseline. The math is helpful, but the tire maker’s spec sheet is still the final source because tread depth, casing design, load range, and measuring rim can change the published dimensions.
What Is the Width of a 285/70R17 Tire?
A 285/70R17 tire has a nominal section width of 285 mm, or about 11.22 inches. This is the sidewall-to-sidewall measurement when the tire is mounted on its measuring rim and inflated under standard measuring conditions. It is not the same as tread width.
In real product specs, the published overall width may be slightly different from 11.22 inches. For example, Mickey Thompson lists some 285/70R17 Baja Boss A/T versions with widths around 11.5 to 11.6 inches, depending on the version and load range. Mickey Thompson
Note: Section width is not tread width. Two 285/70R17 tires can share the same size label but have different tread widths, shoulder shapes, and mounted widths.
How Tall Is a 285/70R17 Tire?
A 285/70R17 tire has a calculated overall diameter of about 32.71 inches, or about 830.8 mm. Here is the simple formula:
- Sidewall height: 285 mm × 0.70 = 199.5 mm
- Sidewall height in inches: 199.5 ÷ 25.4 = 7.85 inches
- Overall diameter: 17 + 7.85 + 7.85 = 32.71 inches
That height gives you a useful amount of sidewall for trucks, SUVs, overlanding builds, and all-terrain setups. It can also improve ground clearance compared with many smaller factory sizes. Still, you should check the actual tire model, because some published 285/70R17 diameters land closer to 32.7, 32.8, or even 33.0 inches.
Is a 285/70R17 a True 33-Inch Tire?
A 285/70R17 is near 33 inches, but the calculated diameter is about 32.71 inches. That makes it slightly smaller than a mathematical 33-inch tire. In everyday tire shopping, many people group it with 33-inch options because the difference is small.
The important detail is that “33-inch tire” can mean two things. It can mean a tire with a calculated or published diameter close to 33 inches, or it can mean a flotation-size tire such as 33×12.50R17. Even flotation sizes are not always exact. Some 33×12.50R17 tires publish actual diameters below 33 inches, depending on the brand and model.
Actual Tire Diameter
The calculated diameter of a 285/70R17 is about 32.71 inches. Manufacturer specs can vary because tire makers measure mounted dimensions on a listed measuring rim. Toyo, Falken, and Mickey Thompson spec sheets show that published 285/70R17 dimensions and approved rim ranges are not identical across all tire lines. Toyo Tires Falken Tires Mickey Thompson
Why It’s Not Exactly 33
The size label gives you the math. A 285 mm section width with a 70% aspect ratio creates a 199.5 mm sidewall. When you convert that sidewall height to inches and add the 17-inch wheel, the result is about 32.71 inches, not exactly 33 inches.
That small difference usually does not matter much by itself. What matters more is the tire you are replacing, your vehicle’s clearance, the wheel offset, and whether your speedometer or transmission shift behavior needs recalibration.
Closest 33-Inch Alternatives
If you want a tire that sits in the 33-inch range, compare the published specs for the exact model you plan to buy. Common nearby options include:
- 285/70R17: near-33 height with a narrower profile than many 12.50-inch flotation tires
- 33×10.50R17: nominal 33-inch height with a narrower footprint, if available in the tire model you want
- 33×12.50R17: wider nominal 33-inch option with more clearance demands
- 305/65R17: wider metric option with a similar calculated diameter
- 285/75R17: taller metric option, about 33.8 inches by calculation
Pro Tip: Do not shop by the rounded “33-inch” label alone. Compare overall diameter, section width, approved rim width, load rating, and the tire maker’s measuring rim.
How Does 285/70R17 Compare to 33×12.50R17?
The main difference is width. A 285/70R17 is about 11.22 inches wide by nominal metric conversion. A 33×12.50R17 is a wider flotation-size tire, with a nominal 12.50-inch section width. In real specs, however, both height and width can vary by tire model.
| Spec | 285/70R17 | 33×12.50R17 |
|---|---|---|
| Nominal width | 285 mm, about 11.22 inches | 12.50 inches nominal |
| Calculated or nominal height | About 32.71 inches by formula | 33 inches nominal, but actual specs vary |
| Fitment feel | Leaner, often easier to fit | Wider stance, more rubbing risk |
| Wheel needs | Often works well around 8.0 to 9.0 inches, depending on tire specs | Often needs a wider approved rim range |
| Best for | Daily-driven trucks and SUVs needing near-33 height | Wider off-road stance and aggressive builds |
Choose the 285/70R17 if you want near-33 height without as much width. Choose a 33×12.50R17 only after confirming wheel width, offset, fender clearance, mud-flap clearance, and suspension travel.
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What Wheels Fit 285/70R17 Tires?
A 285/70R17 tire must go on a 17-inch wheel. You cannot mount it correctly on a 16-inch, 18-inch, 19-inch, or 20-inch wheel because the final number in the tire size must match the wheel diameter.
Rim width needs more care. Many 285/70R17 tires list an approved rim-width range around 7.5 to 9.0 inches or 7.5 to 9.5 inches. The exact range depends on the tire model. For example, Falken lists some LT285/70R17 Wildpeak M/T sizes with a 7.5- to 9.0-inch approved rim range, while Toyo and Mickey Thompson list some 285/70R17 options with 7.5- to 9.5-inch ranges. Falken Tires Toyo Tires Mickey Thompson
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Recommended Rim Widths
For many setups, a 17×8.5 wheel is the clean middle ground because 8.5 inches is commonly used as a measuring rim or preferred fit for this size. A 17×8 or 17×9 can also work when it falls within the tire maker’s approved range.
- 17×7.5: may be approved on many models, but sidewall shape can feel more tucked.
- 17×8: balanced fit for many daily-driven trucks and SUVs.
- 17×8.5: common sweet spot for support, sidewall shape, and tread contact.
- 17×9: common choice for a firmer stance and wider wheel fitment.
- 17×9.5: only use it if your exact tire model approves that width.
Ideal Wheel Diameters
The ideal wheel diameter is simple: a 285/70R17 tire needs a 17-inch wheel. The “R17” part of the size tells you the tire’s bead seat diameter.
| Wheel Diameter | Fitment |
|---|---|
| 17-inch | Correct |
| 16-inch | Will not fit this tire size |
| 18-inch | Will not fit this tire size |
| 20-inch | Will not fit this tire size |
Fitment and Clearance
Wheel diameter and rim width are only part of fitment. You also need the right offset, backspacing, fender clearance, brake clearance, and suspension clearance. A 285/70R17 tire can rub on control arms, sway bars, mud flaps, body mounts, liners, or fenders if the wheel position is wrong.
- Turn the steering fully left and right to check front clearance.
- Check suspension compression, not just parking-lot clearance.
- Confirm spare tire storage if you carry a full-size spare.
- Match or exceed your vehicle’s required load index and load range.
- Relearn or reset TPMS when your vehicle requires it after wheel or tire changes.
Warning: Never choose a tire only because it fits the wheel. The tire must also meet your vehicle’s load rating, inflation requirements, clearance needs, and intended use.
Do 285/70R17 Tires Change Speedometer Accuracy?
Yes, 285/70R17 tires can change speedometer accuracy if they are larger or smaller than your original tire size. The error comes from overall diameter, not width. A taller tire travels farther per revolution, so your vehicle may move faster than the speedometer shows.
Use this basic formula:
Actual speed = indicated speed × new tire diameter ÷ old tire diameter
For example, if your vehicle came with a 265/70R17 tire that is about 31.6 inches tall by calculation, switching to a 285/70R17 at about 32.7 inches is roughly a 3.5% increase. When the speedometer shows 60 mph, your actual speed may be about 62 mph. If your original tire was closer to 265/65R17, the change can be about 7%. If your original tire was already close to 33 inches, the change may be small.
Discount Tire recommends recalibrating the speedometer any time you change tire size so you can avoid unintended speeding and inaccurate mileage tracking. Discount Tire
What Are the Best Equivalent Sizes for 285/70R17?
The best equivalent size depends on whether you want the same diameter, more width, more sidewall, or easier clearance. A 285/70R17 is already a near-33-inch tire, so small changes can affect rubbing, gearing, and speedometer readings.
- 275/70R17: slightly narrower and slightly shorter, often easier to fit.
- 285/70R17: balanced near-33-inch metric size with moderate width.
- 305/65R17: wider, with a similar calculated diameter.
- 295/70R17: wider and a little taller than 285/70R17.
- 285/75R17: similar width but taller, about 33.8 inches by calculation.
- 33×12.50R17: wider nominal flotation size with more clearance demands.
If you want the least disruption, stay close to the original tire diameter. If you want more ground clearance, a taller size can help, but it may require trimming, different wheels, a lift, recalibration, or gearing changes.
What Vehicles Use 285/70R17 Tires?
You will often see 285/70R17 tires on trucks, SUVs, off-road trims, and modified 4×4 builds. They are common on platforms such as the Jeep Wrangler, Jeep Gladiator, Toyota 4Runner, Toyota Tacoma, Ford F-150, Chevrolet Colorado, and similar vehicles when the wheel, suspension, and clearance setup supports the size.
That does not mean every trim uses 285/70R17 as a factory size. Some vehicles use this size from the factory on specific trims, while others use it as an aftermarket upgrade. Falken notes that LT285/70R17 Wildpeak M/T options are associated with Jeep Wrangler Rubicon and Gladiator Rubicon fitments, while also offering different load-range versions for different vehicle needs. Falken Tires
Before installing this size, check your owner’s manual, door placard, wheel specs, load rating, and local vehicle modification rules. A tire that fits one trim may rub or overload another trim.
Frequently Asked Questions
Are 285/70R17 tires the same as 33-inch tires?
Not exactly. A 285/70R17 tire has a calculated diameter of about 32.71 inches, so it is very close to a 33-inch tire. Many drivers call it a 33, but actual published diameter varies by tire model.
What is the best wheel width for 285/70R17?
A 17×8.5 wheel is a common sweet spot for many 285/70R17 tires. Many models approve 7.5 to 9.0 inches or 7.5 to 9.5 inches, but you should always follow the exact tire manufacturer’s approved rim-width range.
Is 285/70R17 the same as a 35-inch tire?
No. A 285/70R17 is about 32.7 inches tall by calculation. A typical 35-inch tire is much taller and usually needs more clearance, different gearing considerations, and more careful fitment planning.
Is a 285/75R17 a 33-inch tire?
Yes, it is in the 33-inch range, but it is taller than a 285/70R17. A 285/75R17 calculates to about 33.83 inches tall, so it may need more clearance and can create a larger speedometer change.
Will 285/70R17 tires fit a stock truck or SUV?
Sometimes, but not always. Fit depends on the vehicle, trim, wheel offset, rim width, suspension, fender clearance, and tire model. Check full-lock steering clearance and suspension compression before assuming the size fits.
Do I need to recalibrate my speedometer after switching to 285/70R17?
You may need to recalibrate if the new tire diameter is different from your original tire. The larger the diameter change, the larger the speedometer and odometer error. A tire shop, dealer, or calibration tool can help depending on the vehicle.
Conclusion
A 285/70R17 tire is about 11.2 inches wide and 32.7 inches tall by calculation. It is close enough to 33 inches that many people group it with 33-inch tires, but you should still check the exact tire model’s published specs before buying.
For the best fit, match the tire to a 17-inch wheel, follow the manufacturer’s approved rim-width range, confirm clearance, and make sure the load rating fits your vehicle. If the new tire is taller than your original size, verify speedometer accuracy after installation.
Sources
- Bridgestone Americas — tire-size markings, section width, aspect ratio, and wheel diameter.
- Tire Industry Association — sidewall reading, section width, and aspect ratio definitions.
- Toyo Tires Open Country A/T III — manufacturer examples for 285/70R17 dimensions and approved rim-width ranges.
- Falken Wildpeak M/T — manufacturer examples for LT285/70R17 specifications and approved rim widths.
- Mickey Thompson Baja Boss A/T — manufacturer examples showing actual 285/70R17 and 33×12.50R17 spec variation.
- Discount Tire — speedometer recalibration guidance after tire-size changes.
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