165/65R14 vs 185/60R14
Switching from 165/65R14 to 185/60R14 increases the overall diameter by 7.5 mm (1.3%). That is within the usual ±3% guideline.
| 165/65R14 | 185/60R14 | Difference (mm / revs) | |
|---|---|---|---|
| Section width | 165 mm | 185 mm | +20.0 |
| Sidewall height | 107.2 mm | 111.0 mm | +3.8 |
| Rim diameter | 355.6 mm | 355.6 mm | +0.0 |
| Overall diameter | 570.1 mm | 577.6 mm | +7.5 |
| Circumference | 1,791.0 mm | 1,814.6 mm | +23.6 |
| Revolutions | 558 per km | 551 per km | -7.0 |
Speedometer effect
With 185/60R14 fitted on a car calibrated for 165/65R14, the real speed when the speedometer shows:
| Speedometer shows | Actual speed |
|---|---|
| 50 km/h | 50.7 km/h |
| 80 km/h | 81.1 km/h |
| 100 km/h | 101.3 km/h |
| 120 km/h | 121.6 km/h |
Larger tires make the car go faster than the speedometer shows. Most speedometers also read slightly high from the factory.
Before you change size
- Check the sizes approved for your vehicle on the door-jamb placard or in the owner's manual.
- Check clearance to suspension, brakes and arches at full lock and full compression.
- Match or exceed the original load index and speed rating.
- Wider tires need an appropriate rim width; a 185 mm tire has a manufacturer-specified rim width range.
165/65R14 dimensions · 185/60R14 dimensions · Open in calculator