285/50R20 tire size
A 285/50R20 tire is 31.2 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
- 31.22″ (793 mm)
- Section width
- 11.22″ (285 mm)
- Sidewall height
- 5.61″ (143 mm)
- Wheel diameter
- 20″
- Circumference
- 98.1″
- Revolutions per mile
- 646
What 285/50R20 means
- 285: the tire is 285 mm (11.2 in) wide from sidewall to sidewall.
- 50: the sidewall is 50% of the width, 142.5 mm (5.61 in) tall.
- R: radial construction, used by almost every modern tire.
- 20: it fits a 20-inch wheel.
Overall diameter = 20 + 2 × 5.61 = 31.22 inches.
Sizes equivalent to 285/50R20
These sizes are within 3% of the overall diameter, the usual limit for swapping without speedometer problems.
| Size | Diameter | Difference | Speedometer at 60 mph |
|---|---|---|---|
| 295/40R22 | 31.3″ | +0.2% | 60.1 mph actual |
| 285/45R21 | 31.1″ | -0.4% | 59.8 mph actual |
| 265/45R22 | 31.4″ | +0.5% | 60.3 mph actual |
| 265/50R21 | 31.4″ | +0.7% | 60.4 mph actual |
| 295/45R21 | 31.5″ | +0.7% | 60.4 mph actual |
| 285/40R22 | 31.0″ | -0.8% | 59.5 mph actual |
| 265/55R20 | 31.5″ | +0.8% | 60.5 mph actual |
| 305/40R22 | 31.6″ | +1.2% | 60.7 mph actual |
| 275/50R20 | 30.8″ | -1.3% | 59.2 mph actual |
| 295/50R20 | 31.6″ | +1.3% | 60.8 mph actual |
Going a size taller? 275/55R20 is 31.9″ tall, 2.2% more than 285/50R20. Compare any two sizes in the tire size calculator.
See every common size side by side in the tire size chart.
Questions
What is 285/50R20 in inches?
A 285/50R20 tire is about 31.2 inches tall (793 mm) and 11.2 inches wide, on a 20-inch wheel. In flotation sizing that's roughly 31.2x11.2R20.
How tall is a 285/50R20 tire?
The overall diameter is 31.22 inches: the 20-inch wheel plus two 5.61-inch sidewalls. Actual tires vary by a few tenths of an inch between brands and models.
How many revolutions per mile does a 285/50R20 make?
About 646 revolutions per mile, from a circumference of 98.1 inches.
