235/60R18 tire size
A 235/60R18 tire is 29.1 inches tall and 9.3 inches wide. Here are its full dimensions, what the numbers mean, and the sizes you can swap it for.
- Overall diameter
- 29.10″ (739 mm)
- Section width
- 9.25″ (235 mm)
- Sidewall height
- 5.55″ (141 mm)
- Wheel diameter
- 18″
- Circumference
- 91.4″
- Revolutions per mile
- 693
What 235/60R18 means
- 235: the tire is 235 mm (9.3 in) wide from sidewall to sidewall.
- 60: the sidewall is 60% of the width, 141.0 mm (5.55 in) tall.
- R: radial construction, used by almost every modern tire.
- 18: it fits a 18-inch wheel.
Overall diameter = 18 + 2 × 5.55 = 29.10 inches.
Sizes equivalent to 235/60R18
These sizes are within 3% of the overall diameter, the usual limit for swapping without speedometer problems.
| Size | Diameter | Difference | Speedometer at 60 mph |
|---|---|---|---|
| 215/60R19 | 29.2″ | +0.2% | 60.1 mph actual |
| 255/55R18 | 29.0″ | -0.2% | 59.9 mph actual |
| 255/50R19 | 29.0″ | -0.2% | 59.9 mph actual |
| 255/45R20 | 29.0″ | -0.2% | 59.9 mph actual |
| 235/55R19 | 29.2″ | +0.3% | 60.2 mph actual |
| 215/65R18 | 29.0″ | -0.3% | 59.8 mph actual |
| 235/50R20 | 29.3″ | +0.5% | 60.3 mph actual |
| 215/55R20 | 29.3″ | +0.7% | 60.4 mph actual |
| 225/50R20 | 28.9″ | -0.8% | 59.5 mph actual |
| 225/55R19 | 28.7″ | -1.2% | 59.3 mph actual |
Going a size taller? 245/60R18 is 29.6″ tall, 1.6% more than 235/60R18. Compare any two sizes in the tire size calculator.
See every common size side by side in the tire size chart.
Questions
What is 235/60R18 in inches?
A 235/60R18 tire is about 29.1 inches tall (739 mm) and 9.3 inches wide, on a 18-inch wheel. In flotation sizing that's roughly 29.1x9.3R18.
How tall is a 235/60R18 tire?
The overall diameter is 29.10 inches: the 18-inch wheel plus two 5.55-inch sidewalls. Actual tires vary by a few tenths of an inch between brands and models.
Can I put 245/60R18 instead of 235/60R18?
245/60R18 is 0.47 inches taller (1.6%) 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 235/60R18 make?
About 693 revolutions per mile, from a circumference of 91.4 inches.
