What Size Tire Is A 285 70 R17? | Inches, Height, Fit

A 285/70R17 tire is about 32.7 inches tall, about 11.2 inches wide, and fits a 17-inch wheel.

If you’re staring at 285/70R17 on a sidewall, the plain read is simple: this is a wide, tall 17-inch tire that lands near 33 inches in overall height. That makes it a common pick for trucks, body-on-frame SUVs, and trail builds that want more sidewall without jumping to a much bigger tire.

The size code also tells you more than most people think. Once you break it into pieces, you can estimate ride height, wheel-well fill, spare fit, and whether the tire may brush liners or mud flaps on turns. That’s handy when you’re buying a new set, checking a lift setup, or matching a full-size spare.

What Size Tire Is A 285 70 R17 In Inches?

Here’s the clean conversion for a 285/70R17 tire:

• 285 = tire width in millimeters
• 70 = sidewall height as 70% of the width
• R = radial construction
• 17 = wheel diameter in inches

Do the math and you get a tire that is about 11.22 inches wide, with a sidewall height of about 7.85 inches. Add two sidewalls to the 17-inch wheel, and the overall diameter comes out to about 32.71 inches.

That’s why people round this size to a 33-inch tire. It’s not exactly 33 inches on paper, but it’s close enough that the nickname stuck. Depending on the brand, tread pattern, load range, and wheel width, the real mounted size can move a bit from that paper spec.

How The Code Breaks Down On The Tire

The first number, 285, is the section width. That is the tire’s widest point in millimeters, not the tread width from edge to edge on the ground. Convert 285 millimeters to inches and you get 11.22 inches.

The second number, 70, is the aspect ratio. It means the sidewall height is 70% of the tire’s width. So 285 × 0.70 gives 199.5 millimeters, which works out to about 7.85 inches of sidewall.

The last number, 17, is the wheel diameter. So this tire mounts on a 17-inch wheel, not a 16 and not an 18. If you want the manufacturer-style readout of sidewall markings, Tire Rack’s sidewall size explainer walks through the same numbering pattern used on modern radial tires.

What Those Measurements Mean In Real Driving

A tire in this size usually gives a fuller stance than stock on many trucks and 4×4 SUVs. You get a taller sidewall, which can smooth out sharp edges in the road and give you more room to air down off pavement. You also get extra width, which can add grip and a chunkier look.

But width and height change more than looks. A wider tire can get closer to upper control arms, sway bars, liners, and bumper corners. A taller tire also changes gearing a bit, which can soften acceleration and nudge the speedometer off if the vehicle was set up for a smaller size.

Part Or Measurement	What It Means	285/70R17 Result
285	Section width in millimeters	285 mm
70	Aspect ratio	70% of width
R	Radial construction	Radial tire
17	Wheel diameter	17 inches
Section width in inches	Metric width converted to inches	11.22 in
Sidewall height	285 × 0.70	7.85 in
Overall diameter	17 + 2 sidewalls	32.71 in
Circumference	Distance around the tire	102.76 in
Revolutions per mile	Approximate turns in one mile	About 617

Why 285/70R17 Is Often Called A 33-Inch Tire

In garage talk, people round tire height to the nearest easy number. Since 32.71 inches sits right next to 33, a 285/70R17 is usually grouped with other “33s.” That shorthand is fine for casual talk, but fitment gets tighter when you’re working with real measurements instead of rounded names.

That difference matters when your wheel wells are already tight. A tire that measures 32.7 inches on one brand may stand a touch taller or wider than another once mounted. Aggressive shoulder lugs can also eat up clearance that a smoother all-terrain tire would leave alone.

Width, Height, And Stance

A 285/70R17 is not only tall; it’s also fairly wide. That gives the vehicle a planted, full-wheel-well look. On a stock wheel, it often sits close to suspension parts on the inside. On an aftermarket wheel with less backspacing or a more pushed-out offset, it can move outward and meet the fender or liner sooner.

That’s why tire fit is never just a height question. The wheel matters. The offset matters. The tread pattern matters. A narrow all-terrain and a chunky mud-terrain can share the same printed size and still behave differently at full lock.

Where Fitment Usually Gets Tricky

Before buying a 285/70R17, check these points on your vehicle:

• Current tire size on the door-jamb placard
• Wheel width and offset
• Clearance at full steering lock
• Clearance during compression off-road
• Space for the spare under the rear or inside the cargo area

It also helps to run the numbers against your stock size. Goodyear’s tire size calculator gives you a fast side-by-side check so you can see the jump in diameter and sidewall before you order.

Nearby Tire Sizes And How They Compare

If you’re deciding between close 17-inch sizes, diameter tells only part of the story. One step down can make fitment easier and keep gearing closer to stock. One step up can fill the wheel well more, but it can also bring extra weight, extra rub points, and a bigger speedometer shift.

Tire Size	Overall Diameter	What Changes
265/70R17	About 31.6 in	Narrower and shorter; easier fit on stock setups
275/70R17	About 32.2 in	Middle step; mild height gain without as much width
285/70R17	About 32.7 in	Near-33 size; fuller stance and more sidewall
285/75R17	About 33.8 in	Same width, more height; rub risk rises fast
315/70R17	About 34.4 in	Much wider and taller; often needs more wheel and body clearance

When A 285/70R17 Is A Good Match

This size makes sense when you want a near-33-inch tire without moving into a much heavier or bulkier setup. It’s a common sweet spot for daily-driven 4x4s that still see dirt, snow, gravel, or ruts on weekends. The taller sidewall gives the tire more cushion, and the width can add grip on loose ground.

It also works well for drivers who want a stronger visual change than a stock-size replacement. A 285/70R17 usually fills the wheel well better, especially on midsize and full-size trucks with 17-inch wheels. You get a tougher stance without stepping straight into the next size class.

When It Can Be Too Much

If your vehicle is tight from the factory, a 285/70R17 can be more tire than the stock wheels, stock offset, or stock liners want to deal with. Some vehicles take it with no drama. Others need trimming, a small lift, a wheel with a different offset, or all three.

You should also think about weight. Many tires sold in this size come in tougher constructions meant for trucks and rougher use. That can add unsprung weight, which may change braking feel, ride, and fuel use. If your truck spends most of its life on pavement, that trade may not be worth it.

The Takeaway On 285/70R17

A 285/70R17 tire is about 32.7 inches tall, 11.2 inches wide, and built for a 17-inch wheel. In plain talk, it’s a near-33-inch tire with enough width and sidewall to change both fitment and feel on the road.

If you’re only trying to decode the number, that’s the answer. If you’re buying a set, go one step further and compare it with your stock size, wheel specs, and clearance points. That extra five-minute check can tell you whether this size will bolt on cleanly or turn into a rub-and-trim project.