How Tall Is a 235/75R15 Tire? | Exact Numbers

A 235/75R15 tire measures about 28.9 inches in overall diameter—that’s the total height when mounted.

If you’re replacing tires, planning a lift, or checking garage clearance, the question at the heart of how tall a 235/75R15 tire is comes down to three numbers: the overall diameter, the sidewall height, and the section width. The size code itself tells the story—235 mm wide, 75 percent aspect ratio sidewall, fitting a 15-inch wheel.

Here’s the short version: this tire stands roughly 28.9 inches tall, depending slightly on the manufacturer and measuring standard. That puts it in the sweet spot for trucks, SUVs, and off-road rigs looking for a bit more ground clearance than a factory 225 or 235/70 setup.

How Those Numbers Are Calculated

Tire dimensions come straight from the sidewall markings. The first number, 235, is the section width in millimeters—the widest point of the tire when mounted and properly inflated. The second number, 75, is the aspect ratio: the sidewall height expressed as a percentage of the width. So the sidewall is 75 percent of 235 mm, which works out to 176.25 mm, or about 6.94 inches.

To get overall height, double the sidewall and add the wheel diameter. Two sidewalls (6.94 + 6.94 inches) plus the 15-inch rim gives you roughly 28.88 inches. Tire calculators like the one at tiresize.com’s size calculator confirm that figure, as do the tools at 1010tires and The Ranger Station.

Why Identical Sizes Can Vary Slightly

Published specs across calculators cluster right around 28.9 inches, but you will see small differences between brands and even between models from the same manufacturer. A tire’s actual diameter shifts with tread depth, air pressure, and the width of the rim it’s mounted on. A wider wheel can flatten the profile slightly; a taller tread block adds a fraction of an inch when new.

Those differences rarely matter for clearance planning, but they do show up in the fine print. A current product listing for the Hankook Dynapro AT2 Xtreme RF12, for instance, shows a 28.88-inch diameter with a 109 load index and a T speed rating. The Ironman All Country AT2 lists 28.9 inches and the same load and speed ratings on its XL version.

How It Compares To Nearby Sizes

• 225/75R15:
• 235/70R15:
• 30×9.50R15: A common flotation-size alternative that runs about 29.5 inches tall.

Rim width guidance for a 235/75R15 typically runs 6 to 8 inches on passenger tires, and 6 to 7 inches on LT-rated versions. One product spec page lists an approved rim width of 6.5 to 8 inches for an all-terrain model in this size.

Frequently Overlooked Fitment Factors

The most common mistake people make with this size is reading “235” as the tire’s height. It’s not—it’s the width across the tread. The actual height comes from the sidewall percentage plus the rim diameter. The second mistake is assuming every “identical” tire measures exactly the same. Real-world diameters vary by model, so always check the manufacturer’s spec sheet before trusting a clearance number.

Before mounting, confirm two things: that your wheels fall within the tire’s approved rim-width range, and that the taller diameter won’t rub on your fenders, suspension, or brake lines at full steering lock. If you’re shopping for a set that matches factory specs, our tested roundup of the best 235/75R15 tires compares the top highway and all-terrain options side by side.

FAQs

What does the 75 in 235/75R15 mean?

The 75 is the aspect ratio: the sidewall height is 75 percent of the tire’s 235 mm section width. That gives a sidewall of roughly 176 mm, or about 6.94 inches. Lower numbers mean shorter sidewalls and a sportier, firmer ride; higher numbers mean taller sidewalls and more cushioning.

Will a 235/75R15 fit on a 15×7 wheel?

Yes, a 15×7 wheel falls squarely within the typical approved rim-width range of 6 to 8 inches for this tire size. The 7-inch width is the most common recommendation for passenger and light-truck fitments. If your wheel is narrower or wider than that range, the tire will still mount, but the tread footprint and wear pattern will shift.

How much taller is a 235/75R15 than a 235/70R15?

That extra height also changes speedometer readings slightly, so re-calibration may be needed on some vehicles.