185/65R15 vs 195/60R15
Switching from 185/65R15 to 195/60R15 decreases the overall diameter by 6.5 mm (1.0%). That is within the usual ±3% guideline.
| 185/65R15 | 195/60R15 | Difference (mm / revs) | |
|---|---|---|---|
| Section width | 185 mm | 195 mm | +10.0 |
| Sidewall height | 120.2 mm | 117.0 mm | -3.2 |
| Rim diameter | 381.0 mm | 381.0 mm | +0.0 |
| Overall diameter | 621.5 mm | 615.0 mm | -6.5 |
| Circumference | 1,952.5 mm | 1,932.1 mm | -20.4 |
| Revolutions | 512 per km | 518 per km | +6.0 |
Speedometer effect
With 195/60R15 fitted on a car calibrated for 185/65R15, the real speed when the speedometer shows:
| Speedometer shows | Actual speed |
|---|---|
| 50 km/h | 49.5 km/h |
| 80 km/h | 79.2 km/h |
| 100 km/h | 99.0 km/h |
| 120 km/h | 118.7 km/h |
Smaller tires make the speedometer read higher than the actual speed. 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 195 mm tire has a manufacturer-specified rim width range.
185/65R15 dimensions · 195/60R15 dimensions · Open in calculator