How Big Is a 275/70R17 Tire? | Size, Specs And Fitment

A 275/70R17 tire measures roughly 32.2 inches tall and 10.8 inches wide, fitting a 17-inch wheel.

If you’re shopping for new rubber or upgrading your truck or SUV, knowing the physical size of a 275/70R17 tire matters more than the numbers stamped on the sidewall. This size is common on light trucks and off-road rigs, and its dimensions determine everything from ground clearance to speedometer accuracy.

The “275” refers to the section width in millimeters, the “70” is the aspect ratio (sidewall height as a percentage of width), and the “17” is the wheel diameter in inches. The math works out to a tire that’s about 32.16–32.2 inches tall overall, with a section width of about 10.83 inches and a sidewall height of roughly 7.58 inches.

What Does Each Number In 275/70R17 Mean?

The sizing system breaks down into three parts that define the tire’s shape. The section width of 275 mm converts to 10.83 inches, measured from the widest point of the sidewall, not the tread. The 70-series aspect ratio means the sidewall height is 70% of the width, working out to 192.5 mm or 7.58 inches.

The R stands for radial construction, and the 17 indicates the wheel diameter in inches. Because the sidewall height is seven and a half inches, this tire offers substantial cushioning and off-road capability compared to lower-profile options.

These dimensions produce a circumference of about 101 inches and roughly 627 revolutions per mile. That circumference figure matters for speedometer calibration and gear ratios.

How Does It Compare To Other Common Sizes?

The 275/70R17 is often called a “32-inch” tire, but it actually measures about 32.2 inches in diameter, slightly shy of a full 33 inches. Compared to a 265/70R17, the 275 variant is about 1.7% larger in diameter, a difference that can slightly affect speedometer readings and require a recalibration for accurate mileage.

In off-road shorthand, this size is sometimes labeled as a 32.2×10.8R17, which captures the overall diameter and width at a glance. For most trucks and SUVs that came with a 31-inch or 32-inch factory tire, this represents a modest size upgrade that improves ground clearance without requiring major suspension modifications.

The rim width range for this tire generally falls between 7.0 and 8.5 inches, though some calculators extend that to 9.0 inches depending on the brand and model. Confirming your wheel’s actual width before purchasing is essential, as mounting on too-narrow or too-wide rims affects handling and tire wear.

Real Specs From Popular 275/70R17 Models

Actual dimensions vary by manufacturer, so the specs above represent the nominal size. Published numbers for leading light-truck models show how much real-world variance exists:

These LT versions weigh 54–55 pounds each and carry substantial load ratings. The Cooper Discoverer AT3 comes in both C and E load-range versions with different pressure and load specs.

If you’re comparing options for your truck, our tested roundup of the best 275 70R16 tires covers similar all-terrain choices on the smaller 16-inch wheel.

What Fits And What To Double-Check

Before buying, verify the tire’s approved rim-width range against your wheel’s actual width. Tiresize.com’s 275/70R17 spec page lists the standard dimensions and fitment details, but the determining factor is always the specific tire model’s published fit range.

Pay attention to whether you’re buying an LT (light truck) or P-metric passenger tire. Most 275/70R17 examples are LT tires with C or E load ranges, designed for trucks and SUVs rather than cars. LT tires have stiffer sidewalls, higher max pressures, and heavier weights, which affects ride quality and fuel economy.

One common mistake is assuming the section width equals the tread width. The 10.83-inch section width is measured at the widest point of the sidewall; the tread is typically narrower, especially on all-terrain designs with rounded shoulders. Similarly, don’t assume all 275/70R17s measure a full 33 inches, because they generally don’t.