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A 275/60R20 tire is about 33.0 inches tall and 10.8 inches wide, and it fits a 20-inch wheel. That makes it the metric equivalent of a 33-inch tire, which is why it is such a popular size on half-ton pickups and full-size SUVs.
| Measurement | 275/60R20 |
|---|---|
| Overall diameter (height) | 32.99 in (838 mm) |
| Section width | 10.83 in (275 mm) |
| Sidewall height | 6.50 in (165 mm) |
| Wheel diameter | 20 in |
| Circumference | 103.6 in |
| Revolutions per mile | about 611 |
These are calculated figures. The exact height of a mounted tire varies by brand, tread depth and inflation, usually by a few tenths of an inch, so check the manufacturer’s spec sheet if you need a precise number for clearance.
How to convert 275/60R20 to inches
Every metric tire size follows the same pattern, and you only need three steps to turn it into inches:
- Width: 275 is the section width in millimeters. 275 ÷ 25.4 = 10.83 inches.
- Sidewall: 60 is the aspect ratio, meaning the sidewall is 60% as tall as the tire is wide. 275 × 0.60 = 165 mm, or 6.50 inches.
- Overall diameter: add the sidewall twice (top and bottom) to the wheel size. 20 + (2 × 6.50) = 32.99 inches, which rounds to 33.0.
The “R” means radial construction, which is what almost every modern passenger and light truck tire uses.
Is a 275/60R20 the same as a 33-inch tire?
In height, yes. A 33×12.50R20 flotation tire and a 275/60R20 are both about 33 inches tall. The difference is width: a 33×12.50R20 is roughly 12.5 inches wide, about 1.7 inches wider than a 275/60R20, so it needs more room in the wheel well and usually a wider wheel. If you want the 33-inch look without wider tires sticking out past the fenders, the 275/60R20 is the easier fit.
275/60R20 compared with nearby sizes
Here is how 275/60R20 compares with the sizes people most often consider instead. The speedometer column shows what your speedometer would read at a true 60 mph if your truck were calibrated for 275/60R20.
| Size | Diameter | Width | Height difference | Speedometer at a true 60 mph |
|---|---|---|---|---|
| 275/55R20 | 31.91 in | 10.83 in | −1.08 in (−3.3%) | 62.0 mph |
| 265/60R20 | 32.52 in | 10.43 in | −0.47 in (−1.4%) | 60.9 mph |
| 275/60R20 | 32.99 in | 10.83 in | — | 60.0 mph |
| 275/70R18 | 33.16 in | 10.83 in | +0.17 in (+0.5%) | 59.7 mph |
| 285/60R20 | 33.46 in | 11.22 in | +0.47 in (+1.4%) | 59.2 mph |
| 275/65R20 | 34.07 in | 10.83 in | +1.08 in (+3.3%) | 58.1 mph |
| 33×12.50R20 | 33.0 in | 12.5 in | about the same | about 60 mph |
A common rule of thumb is to stay within about 3% of the original diameter so your speedometer, transmission shift points and stability control stay accurate. 275/55R20 and 275/65R20 sit right at that limit; 265/60R20 and 285/60R20 are much closer swaps.
Upgrading from 275/55R20 to 275/60R20
This is one of the most popular swaps for trucks that came with 275/55R20 tires. You gain about 1.1 inches of height (roughly half an inch of ground clearance) and a taller, more comfortable sidewall. Many trucks fit it without a lift, but check for rubbing at full steering lock and full suspension travel. Your speedometer will read about 3% low (it shows 60 mph when you are actually doing about 62).
What rim width fits a 275/60R20?
Most tire makers list an approved rim width of about 7.5 to 9.5 inches for 275/60R20, with 8 to 9 inches being ideal. Factory 20-inch wheels on half-ton trucks and SUVs fall in that range. Always confirm the approved range on the specific tire’s spec sheet, because it can vary slightly between models.
What vehicles use 275/60R20 tires?
275/60R20 is an original-equipment size on many 20-inch trims of half-ton pickups and full-size SUVs, including versions of the Ford F-150, Chevrolet Silverado 1500, GMC Sierra 1500, Ram 1500, Chevrolet Tahoe and Suburban, and GMC Yukon. Fitments change by model year and trim, so check the tire placard on your driver’s door jamb before you buy.
Choosing a tire type in 275/60R20
- Highway (H/T): the quietest ride and longest treadwear, with warranties often in the 60,000 to 80,000 mile range. Best if you stay on pavement.
- All-terrain (A/T): the most popular choice on trucks. Better grip on gravel, dirt and light snow, with some extra road noise. Look for the three-peak mountain snowflake symbol if you need real winter traction.
- Mud-terrain (M/T): deep, open treads for mud and rocks. Louder and faster-wearing on the road, so only worth it if you go off-road often.
- Load rating: P-metric and standard load (SL) tires suit most half-ton use. If you tow heavy trailers or carry big loads, look at XL or LT (load range E) versions.
See current 275/60R20 tire prices on Amazon
Frequently asked questions
How tall is a 275/60R20 tire?
About 33.0 inches (32.99 inches calculated, or 838 mm). Actual mounted height varies slightly by brand and tread depth.
How wide is a 275/60R20 tire?
About 10.8 inches (275 mm) at the section width. Tread width is a little narrower and varies by tire model.
Will 275/60R20 fit in place of 275/55R20?
On many half-ton trucks, yes, without a lift. It is about 1.1 inches taller, so check for rubbing at full lock and full suspension compression, and expect your speedometer to read about 3% low.
What is the difference between 275/60R20 and 285/60R20?
A 285/60R20 is about 0.5 inches taller (33.5 inches) and 0.4 inches wider. It is a close swap that adds a slightly more aggressive look.
What PSI should a 275/60R20 tire run at?
Use the pressure on your vehicle’s door jamb placard, not the maximum printed on the tire sidewall. For most half-ton trucks and SUVs with this size, that is in the mid-30s PSI.
Measurements in this guide are calculated from the tire size using the standard formula. For safety-critical fitment, confirm with your vehicle manufacturer or a tire professional.