The new tire changes overall diameter by +10.9%. With a speedometer calibrated to the original tire, that same percentage is how far the speedometer and odometer read off — a taller tire means your true speed is higher than indicated and the odometer under-counts distance.
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 44.4 km/h | 25 mph | 28 mph |
| 60 km/h | 66.5 km/h | 37 mph | 41 mph |
| 80 km/h | 88.7 km/h | 50 mph | 55 mph |
| 100 km/h | 110.9 km/h | 62 mph | 69 mph |
| 120 km/h | 133.1 km/h | 75 mph | 83 mph |
Commonly compared with 185/60R15
- 185/60R15 vs 175/65R15 · 175/65R15 specs
- 185/60R15 vs 195/60R15 · 195/60R15 specs
- 185/60R15 vs 195/55R16 · 195/55R16 specs
- 185/60R15 vs 185/65R15 · 185/65R15 specs
- 185/60R15 vs 225/50R16 · 225/50R16 specs
- 185/60R15 vs 205/55R16 · 205/55R16 specs
- 185/60R15 vs 195/65R15 · 195/65R15 specs
- 185/60R15 vs 215/55R16 · 215/55R16 specs
FAQ
What is the overall diameter of a 185/60R15 tire?
A 185/60R15 tire has an overall diameter of about 23.74 inches (603 mm) and a section width of 185 mm.
What sizes can replace a 185/60R15 tire?
Sizes within about ±3% of 185/60R15's 23.7-inch diameter are the closest matches, such as 175/65R15, 195/60R15, 195/55R16. Use the calculator above to check the exact speedometer effect of any substitute.
Fitment & trouble codes
Changing tire size by more than about 3% shifts the speedometer, odometer and, on some vehicles, ABS/traction calibration — which can set wheel-speed-sensor or vehicle-speed codes. See C1234 (wheel speed sensor) and C0050 (rear wheel speed) if a warning light appears after a size change.