195/65R15 vs 195/70R14
Switching from 195/65R15 to 195/70R14 decreases the overall diameter by 5.9 mm (0.9%). That is within the usual ±3% guideline.
| 195/65R15 | 195/70R14 | Difference (mm / revs) | |
|---|---|---|---|
| Section width | 195 mm | 195 mm | +0.0 |
| Sidewall height | 126.8 mm | 136.5 mm | +9.7 |
| Rim diameter | 381.0 mm | 355.6 mm | -25.4 |
| Overall diameter | 634.5 mm | 628.6 mm | -5.9 |
| Circumference | 1,993.3 mm | 1,974.8 mm | -18.5 |
| Revolutions | 502 per km | 506 per km | +4.0 |
Speedometer effect
With 195/70R14 fitted on a car calibrated for 195/65R15, the real speed when the speedometer shows:
| Speedometer shows | Actual speed |
|---|---|
| 50 km/h | 49.5 km/h |
| 80 km/h | 79.3 km/h |
| 100 km/h | 99.1 km/h |
| 120 km/h | 118.9 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.
195/65R15 dimensions · 195/70R14 dimensions · Open in calculator