225/60R18 tire size
A 225/60R18 tire is 28.6 inches tall and 8.9 inches wide. Here are its full dimensions, what the numbers mean, and the sizes you can swap it for.
- Overall diameter
- 28.63″ (727 mm)
- Section width
- 8.86″ (225 mm)
- Sidewall height
- 5.31″ (135 mm)
- Wheel diameter
- 18″
- Circumference
- 89.9″
- Revolutions per mile
- 704
What 225/60R18 means
- 225: the tire is 225 mm (8.9 in) wide from sidewall to sidewall.
- 60: the sidewall is 60% of the width, 135.0 mm (5.31 in) tall.
- R: radial construction, used by almost every modern tire.
- 18: it fits a 18-inch wheel.
Overall diameter = 18 + 2 × 5.31 = 28.63 inches.
Sizes equivalent to 225/60R18
These sizes are within 3% of the overall diameter, the usual limit for swapping without speedometer problems.
| Size | Diameter | Difference | Speedometer at 60 mph |
|---|---|---|---|
| 245/50R19 | 28.6″ | +0.1% | 60.0 mph actual |
| 245/55R18 | 28.6″ | -0.1% | 60.0 mph actual |
| 245/45R20 | 28.7″ | +0.2% | 60.1 mph actual |
| 205/60R19 | 28.7″ | +0.2% | 60.1 mph actual |
| 225/55R19 | 28.7″ | +0.4% | 60.2 mph actual |
| 205/65R18 | 28.5″ | -0.5% | 59.7 mph actual |
| 215/50R20 | 28.5″ | -0.6% | 59.7 mph actual |
| 225/50R20 | 28.9″ | +0.8% | 60.5 mph actual |
| 205/55R20 | 28.9″ | +0.9% | 60.5 mph actual |
| 235/45R20 | 28.3″ | -1.1% | 59.4 mph actual |
Going a size taller? 255/55R18 is 29.0″ tall, 1.4% more than 225/60R18. Compare any two sizes in the tire size calculator.
See every common size side by side in the tire size chart.
Questions
What is 225/60R18 in inches?
A 225/60R18 tire is about 28.6 inches tall (727 mm) and 8.9 inches wide, on a 18-inch wheel. In flotation sizing that's roughly 28.6x8.9R18.
How tall is a 225/60R18 tire?
The overall diameter is 28.63 inches: the 18-inch wheel plus two 5.31-inch sidewalls. Actual tires vary by a few tenths of an inch between brands and models.
Can I put 235/60R18 instead of 225/60R18?
235/60R18 is 0.47 inches taller (1.7%) 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 225/60R18 make?
About 704 revolutions per mile, from a circumference of 89.9 inches.
