How Tall Are 245/75R17 Tires? | The Real Height, Explained

245/75R17 tires measure about 31.5 inches in overall diameter, making them a common tall option for trucks and SUVs.

For the full breakdown, see our best 245/75R17 AT Tires guide.

The number “245/75R17” is a metric size code, not a direct inch measurement, so the actual height varies slightly by brand and model. For most drivers, the spec that matters is the overall diameter, which lands at roughly 31.5 inches (or 800 mm). That makes this size a popular choice for trucks and SUVs seeking a taller stance without changing the wheel size. Below, we break down every number in the code and what it means for your vehicle.

What Does Each Number In 245/75R17 Mean?

The size code tells you three things: the tire’s width, the sidewall height as a percentage, and the rim diameter it fits. Each element plays a role in the tire’s final height.

• 245 mm width: The section width, which measures about 9.6 inches. This is the widest point of the tire, not the tread contact patch.
• 75 aspect ratio: The sidewall height is 75% of the width, which works out to roughly 183.8 mm or 7.2 inches.
• R (Radial): The tire’s internal construction uses radial layers.
• 17-inch rim: The wheel diameter the tire is designed to mount on.

To get the total height, add the rim diameter to twice the sidewall height: 431.8 mm (17 in) plus 367.5 mm (two sidewalls) equals about 799.3 mm, or 31.5 inches. Tire size calculators like tiresize.com’s 245/75R17 page show the same result, though minor rounding differences are normal.

Key Dimensions: A Quick Reference Table

Here are the essential measurements for 245/75R17 tires, with both metric and imperial values for comparison.

Does The Height Vary Between Tire Brands?

Yes, and this is where many buyers get tripped up. The 31.5-inch figure is a calculated standard, but real-world height can differ by a few tenths of an inch depending on the manufacturer, tread design, and load range. A rugged mud-terrain tire like the Hankook Dynapro MT2 may measure slightly taller than a highway-focused model because of its deeper tread blocks. A Venom Power Terra Hunter X/T or an Armstrong Tru-Trac HT in the same size could differ by a hair as well. Tread depth and air pressure also influence the mounted height slightly.

The practical takeaway: if you’re replacing a worn set and your new tires are the same size from a different brand, the height change is usually small enough to ignore. But for lifted trucks or vehicles with tight clearance, confirming the exact spec against your owner’s manual is worth the effort.

Will 245/75R17 Fit My Truck Or SUV?

Fitment depends on the wheel width and the vehicle’s recommended size, not just the 17-inch rim. Passenger tires in this size generally fit wheels that are 6.5 to 8.0 inches wide, while LT-rated versions typically suit 6.5 to 7.5 inches. If your wheels fall inside that range, mounting is straightforward, but load capacity is a separate concern entirely.

That’s because load ratings are model-specific. Some 245/75R17 tires are sold as Load Range E (10-ply) with a Load Index of 121/118, which suits heavier trucks carrying significant weight. Others use a lighter standard-load construction. The size alone does not guarantee a specific load capacity, so always verify the load index on the sidewall matches what your vehicle needs. If you are exploring all-terrain options for your truck, our tested roundup of the best 245 75r17 at tires is a helpful place to compare popular models side by side.

One common misconception is that the 245 mm figure represents the tread width. It doesn’t; that measurement is the section width, and actual tread width varies by pattern and brand. Another trap is assuming every 245/75R17 measures exactly 31.5 inches, which ignores the small manufacturing and design differences mentioned above.

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