285/55R20 tire size
A 285/55R20 tire is 32.3 inches tall and 11.2 inches wide. Here are its full dimensions, what the numbers mean, and the sizes you can swap it for.
- Overall diameter
- 32.34″ (822 mm)
- Section width
- 11.22″ (285 mm)
- Sidewall height
- 6.17″ (157 mm)
- Wheel diameter
- 20″
- Circumference
- 101.6″
- Revolutions per mile
- 624
What 285/55R20 means
- 285: the tire is 285 mm (11.2 in) wide from sidewall to sidewall.
- 55: the sidewall is 55% of the width, 156.8 mm (6.17 in) tall.
- R: radial construction, used by almost every modern tire.
- 20: it fits a 20-inch wheel.
Overall diameter = 20 + 2 × 6.17 = 32.34 inches.
Sizes equivalent to 285/55R20
These sizes are within 3% of the overall diameter, the usual limit for swapping without speedometer problems.
| Size | Diameter | Difference | Speedometer at 60 mph |
|---|---|---|---|
| 265/50R22 | 32.4″ | +0.3% | 60.2 mph actual |
| 295/45R22 | 32.5″ | +0.3% | 60.2 mph actual |
| 285/50R21 | 32.2″ | -0.4% | 59.8 mph actual |
| 265/55R21 | 32.5″ | +0.4% | 60.2 mph actual |
| 265/60R20 | 32.5″ | +0.5% | 60.3 mph actual |
| 285/45R22 | 32.1″ | -0.8% | 59.5 mph actual |
| 295/50R21 | 32.6″ | +0.8% | 60.5 mph actual |
| 305/50R20 | 32.0″ | -1.0% | 59.4 mph actual |
| 275/55R20 | 31.9″ | -1.3% | 59.2 mph actual |
| 295/55R20 | 32.8″ | +1.3% | 60.8 mph actual |
Going a size taller? 275/60R20 is 33.0″ tall, 2.0% more than 285/55R20. Compare any two sizes in the tire size calculator.
See every common size side by side in the tire size chart.
Questions
What is 285/55R20 in inches?
A 285/55R20 tire is about 32.3 inches tall (822 mm) and 11.2 inches wide, on a 20-inch wheel. In flotation sizing that's roughly 32.3x11.2R20.
How tall is a 285/55R20 tire?
The overall diameter is 32.34 inches: the 20-inch wheel plus two 6.17-inch sidewalls. Actual tires vary by a few tenths of an inch between brands and models.
How many revolutions per mile does a 285/55R20 make?
About 624 revolutions per mile, from a circumference of 101.6 inches.
