285/65R18 tire size
A 285/65R18 tire is 32.6 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
- 32.59″ (828 mm)
- Section width
- 11.22″ (285 mm)
- Sidewall height
- 7.29″ (185 mm)
- Wheel diameter
- 18″
- Circumference
- 102.4″
- Revolutions per mile
- 619
What 285/65R18 means
- 285: the tire is 285 mm (11.2 in) wide from sidewall to sidewall.
- 65: the sidewall is 65% of the width, 185.3 mm (7.29 in) tall.
- R: radial construction, used by almost every modern tire.
- 18: it fits a 18-inch wheel.
Overall diameter = 18 + 2 × 7.29 = 32.59 inches.
Sizes equivalent to 285/65R18
These sizes are within 3% of the overall diameter, the usual limit for swapping without speedometer problems.
| Size | Diameter | Difference | Speedometer at 60 mph |
|---|---|---|---|
| 265/70R18 | 32.6″ | +0.1% | 60.0 mph actual |
| 265/65R19 | 32.6″ | -0.1% | 60.0 mph actual |
| 265/60R20 | 32.5″ | -0.2% | 59.9 mph actual |
| 285/60R19 | 32.5″ | -0.4% | 59.8 mph actual |
| 305/60R18 | 32.4″ | -0.5% | 59.7 mph actual |
| 295/55R20 | 32.8″ | +0.6% | 60.3 mph actual |
| 285/55R20 | 32.3″ | -0.7% | 59.6 mph actual |
| 295/60R19 | 32.9″ | +1.1% | 60.6 mph actual |
| 305/55R19 | 32.2″ | -1.2% | 59.3 mph actual |
| 275/60R20 | 33.0″ | +1.2% | 60.7 mph actual |
Going a size taller? 275/70R18 is 33.2″ tall, 1.8% more than 285/65R18. Compare any two sizes in the tire size calculator.
See every common size side by side in the tire size chart.
Questions
What is 285/65R18 in inches?
A 285/65R18 tire is about 32.6 inches tall (828 mm) and 11.2 inches wide, on a 18-inch wheel. In flotation sizing that's roughly 32.6x11.2R18.
How tall is a 285/65R18 tire?
The overall diameter is 32.59 inches: the 18-inch wheel plus two 7.29-inch sidewalls. Actual tires vary by a few tenths of an inch between brands and models.
How many revolutions per mile does a 285/65R18 make?
About 619 revolutions per mile, from a circumference of 102.4 inches.
