275/55R20 tire size
A 275/55R20 tire is 31.9 inches tall and 10.8 inches wide. Here are its full dimensions, what the numbers mean, and the sizes you can swap it for.
- Overall diameter
- 31.91″ (810 mm)
- Section width
- 10.83″ (275 mm)
- Sidewall height
- 5.95″ (151 mm)
- Wheel diameter
- 20″
- Circumference
- 100.2″
- Revolutions per mile
- 632
What 275/55R20 means
- 275: the tire is 275 mm (10.8 in) wide from sidewall to sidewall.
- 55: the sidewall is 55% of the width, 151.3 mm (5.95 in) tall.
- R: radial construction, used by almost every modern tire.
- 20: it fits a 20-inch wheel.
Overall diameter = 20 + 2 × 5.95 = 31.91 inches.
Sizes equivalent to 275/55R20
These sizes are within 3% of the overall diameter, the usual limit for swapping without speedometer problems.
| Size | Diameter | Difference | Speedometer at 60 mph |
|---|---|---|---|
| 275/50R21 | 31.8″ | -0.3% | 59.8 mph actual |
| 255/50R22 | 32.0″ | +0.4% | 60.2 mph actual |
| 255/55R21 | 32.0″ | +0.4% | 60.3 mph actual |
| 255/60R20 | 32.0″ | +0.4% | 60.3 mph actual |
| 275/45R22 | 31.7″ | -0.5% | 59.7 mph actual |
| 285/45R22 | 32.1″ | +0.6% | 60.4 mph actual |
| 295/50R20 | 31.6″ | -0.9% | 59.4 mph actual |
| 285/50R21 | 32.2″ | +1.0% | 60.6 mph actual |
| 285/55R20 | 32.3″ | +1.4% | 60.8 mph actual |
| 265/55R20 | 31.5″ | -1.4% | 59.2 mph actual |
Going a size taller? 285/55R20 is 32.3″ tall, 1.4% more than 275/55R20. Compare any two sizes in the tire size calculator.
See every common size side by side in the tire size chart.
Questions
What is 275/55R20 in inches?
A 275/55R20 tire is about 31.9 inches tall (810 mm) and 10.8 inches wide, on a 20-inch wheel. In flotation sizing that's roughly 31.9x10.8R20.
How tall is a 275/55R20 tire?
The overall diameter is 31.91 inches: the 20-inch wheel plus two 5.95-inch sidewalls. Actual tires vary by a few tenths of an inch between brands and models.
Can I put 285/55R20 instead of 275/55R20?
285/55R20 is 0.43 inches taller (1.4%) and 10 mm wider. That's within the usual 3% limit, but check that your wheel width is approved for it and that it clears the suspension.
How many revolutions per mile does a 275/55R20 make?
About 632 revolutions per mile, from a circumference of 100.2 inches.
