What Size Tire Is 235 75R15? | Height, Width, And Fit

A 235/75R15 tire is about 28.9 inches tall, 9.3 inches wide, and fits a 15-inch wheel.

If you’re staring at “235/75R15” on a sidewall, the code tells you three plain things: how wide the tire is, how tall the sidewall is in relation to that width, and the wheel size it mounts on. Once you break the code apart, the size stops looking cryptic and starts reading like a set of measurements.

For most drivers, this size lands in the light-truck and SUV lane. It’s a common pick on older pickups, body-on-frame SUVs, and some trailers. It has a decent sidewall, a tall stance, and a 15-inch wheel opening, so it gives a different look and ride than a shorter, lower-profile tire.

Reading The 235/75R15 Code On The Sidewall

Each part of the code has a job. Read from left to right and the meaning is pretty direct. The same sidewall layout shows up on most passenger and light-truck tires.

• 235 is the section width in millimeters. That’s the tire’s width at its widest point, not the tread width.
• 75 is the aspect ratio. The sidewall height is 75% of the width.
• R means radial construction, which is the standard build on modern road tires.
• 15 is the wheel diameter in inches. This tire fits a 15-inch rim, not a 16-inch or 14-inch one.

There’s one extra wrinkle. You may see the size written as P235/75R15 or LT235/75R15. The width, shape, and wheel size stay in the same ballpark, but the tire’s build, load rating, and use case can shift. That’s why size alone doesn’t tell the whole story when you’re buying a replacement set.

What Size Tire Is 235 75R15 In Real Measurements?

On paper, a 235/75R15 is about 9.25 inches wide. The sidewall height works out to about 6.94 inches. Double that sidewall height, add the 15-inch wheel, and you get an overall diameter of about 28.88 inches.

That means this is a tall 15-inch tire. It fills the wheel well better than shorter 15-inch sizes, and the taller sidewall usually rides a bit softer over broken pavement. Brand to brand, the mounted height and width can move a little because tread design, wheel width, and air pressure all nudge the final number.

1. Start with the width: 235 mm.
2. Find 75% of 235 mm to get the sidewall height: 176.25 mm.
3. Convert that sidewall height to inches: 6.94 inches.
4. Add the wheel diameter plus two sidewalls: 15 + 6.94 + 6.94.

That math lands at 28.88 inches tall. The circumference is about 90.72 inches, which works out to roughly 698 revolutions per mile. Those numbers matter when you compare this size with a taller or shorter option, since gearing feel and speedometer reading can shift a bit. You can see the same sidewall structure on Goodyear’s tire size chart.

Measurement	Value	What It Means
Section width	235 mm / 9.25 in	Overall width at the widest point
Aspect ratio	75	Sidewall height is 75% of the width
Sidewall height	176.25 mm / 6.94 in	Height from rim to outer tread edge
Wheel diameter	15 in	Fits a 15-inch rim
Overall diameter	733.5 mm / 28.88 in	Full tire height when mounted
Circumference	90.72 in	Distance in one full turn
Revolutions per mile	About 698	Useful when comparing alternate sizes
Common label variants	P235/75R15, LT235/75R15	Same basic size, different tire type or load class

Where This Tire Size Usually Works Best

A 235/75R15 often shows up on older SUVs and small to midsize trucks that were built around a 15-inch wheel. It’s tall enough to give some sidewall cushion and ground clearance, but it isn’t so wide that it instantly crowds the wheel well on a stock setup.

That balance is a big reason this size stuck around for years. It suits drivers who want a tire that still has some sidewall flex for rough roads, gravel, or winter use, without jumping into oversized off-road territory.

• It usually rides softer than a shorter 15-inch tire.
• It has a classic truck-and-SUV profile.
• It can be easier to fit than wider swap sizes.
• It may help protect the wheel on potholes and ruts.

Still, the right size for your vehicle is the one listed by the maker on the door placard or in the owner’s manual. NHTSA’s tire size and pressure page says drivers should use the tire size listed on the vehicle label or manual, then match the load and pressure specs from there.

Why The Placard Still Wins

Two tires can share the same size code and still differ in load index, speed rating, tread pattern, and casing strength. That’s why a size match is only step one. The placard tells you what the vehicle was built around, including the pressure that the chassis, brakes, and suspension were set up to use.

That matters even more on older trucks and SUVs that may have gone through a few wheel-and-tire swaps over the years. The tire sidewall shows the maximum the tire can take. The vehicle label shows what the vehicle wants.

235/75R15 Size Comparison With Nearby Options

If you’re cross-shopping tire sizes, a near match can look harmless on paper and still change the way the truck sits and drives. A shorter tire can make the speedometer read a touch fast. A taller one can trim wheel-well room and make the speedometer read a touch slow.

Here’s how 235/75R15 stacks up against a few common neighbors in the 15-inch world.

Tire size	Overall diameter	What Changes
225/75R15	28.29 in	Narrower and about 0.59 in shorter
235/70R15	27.95 in	Same width, shorter sidewall, lower stance
255/70R15	29.06 in	Wider and a bit taller; check clearance
30×9.50R15	30.00 in	Older inch-size format; taller than stock

What Changes When You Go Taller Or Shorter

Drop to 235/70R15 and the truck sits a little lower. The sidewall is shorter, so steering can feel a bit tighter, but the ride may turn firmer on rough pavement. Jump to a 30×9.50R15 and you add height, which can look better on some trucks, but you may run into rubbing at full lock or during suspension travel.

Even small changes matter. A tire that is around 3% taller or shorter can nudge the speedometer, the odometer, and the way the transmission feels on hills. On four-wheel-drive rigs, matching overall diameter across all four corners is a smart move.

Buying Notes Before You Mount A Set

If 235/75R15 is the size on your truck now, don’t stop at the big numbers. Check the rest of the sidewall before you buy. The details after the size tell you whether the tire fits the job you do with the vehicle.

• Load index: Make sure the new tire can carry at least what the old one carried.
• Speed rating: Match the rating listed by the maker or stay above it.
• Tread type: Highway, all-terrain, and mud-terrain tires can feel wildly different in daily use.
• Wheel width: A tire can fit the rim diameter and still be a poor match for the wheel’s width.
• Spare tire fit: A taller replacement may not sit in the stock spare location.

If you’re trying to decode the size for a spare, the answer is still the same: 235/75R15 means a tire about 28.9 inches tall for a 15-inch wheel. If you’re trying to buy a full set, pair that number with the placard specs and your usual driving style, then the choice gets much easier.

The Number In Plain English

Strip away the code, and 235/75R15 is a moderately wide, tall tire for a 15-inch rim. It’s a classic truck size: not tiny, not huge, and easy to picture once you know the math. When someone asks what size tire 235 75R15 is, the clean answer is 9.25 inches wide and 28.88 inches tall, with a sidewall just under 7 inches.