185/65R15 tire size
A 185/65R15 tire is 24.5 inches tall and 7.3 inches wide. Here are its full dimensions, what the numbers mean, and the sizes you can swap it for.
- Overall diameter
- 24.47″ (622 mm)
- Section width
- 7.28″ (185 mm)
- Sidewall height
- 4.73″ (120 mm)
- Wheel diameter
- 15″
- Circumference
- 76.9″
- Revolutions per mile
- 824
What 185/65R15 means
- 185: the tire is 185 mm (7.3 in) wide from sidewall to sidewall.
- 65: the sidewall is 65% of the width, 120.3 mm (4.73 in) tall.
- R: radial construction, used by almost every modern tire.
- 15: it fits a 15-inch wheel.
Overall diameter = 15 + 2 × 4.73 = 24.47 inches.
Sizes equivalent to 185/65R15
These sizes are within 3% of the overall diameter, the usual limit for swapping without speedometer problems.
| Size | Diameter | Difference | Speedometer at 60 mph |
|---|---|---|---|
| 165/65R16 | 24.4″ | -0.1% | 59.9 mph actual |
| 195/55R16 | 24.4″ | -0.1% | 59.9 mph actual |
| 175/55R17 | 24.6″ | +0.5% | 60.3 mph actual |
| 175/70R15 | 24.6″ | +0.7% | 60.4 mph actual |
| 185/50R17 | 24.3″ | -0.8% | 59.5 mph actual |
| 175/60R16 | 24.3″ | -0.8% | 59.5 mph actual |
| 205/45R17 | 24.3″ | -0.8% | 59.5 mph actual |
| 195/50R17 | 24.7″ | +0.9% | 60.5 mph actual |
| 205/60R15 | 24.7″ | +0.9% | 60.5 mph actual |
| 195/60R15 | 24.2″ | -1.0% | 59.4 mph actual |
Going a size taller? 195/65R15 is 25.0″ tall, 2.1% more than 185/65R15. Compare any two sizes in the tire size calculator.
See every common size side by side in the tire size chart.
Questions
What is 185/65R15 in inches?
A 185/65R15 tire is about 24.5 inches tall (622 mm) and 7.3 inches wide, on a 15-inch wheel. In flotation sizing that's roughly 24.5x7.3R15.
How tall is a 185/65R15 tire?
The overall diameter is 24.47 inches: the 15-inch wheel plus two 4.73-inch sidewalls. Actual tires vary by a few tenths of an inch between brands and models.
Can I put 195/65R15 instead of 185/65R15?
195/65R15 is 0.51 inches taller (2.1%) 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 185/65R15 make?
About 824 revolutions per mile, from a circumference of 76.9 inches.
