155/65R14 vs 165/65R14
Switching from 155/65R14 to 165/65R14 increases the overall diameter by 13.0 mm (2.3%). That is within the usual ±3% guideline.
| 155/65R14 | 165/65R14 | Difference (mm / revs) | |
|---|---|---|---|
| Section width | 155 mm | 165 mm | +10.0 |
| Sidewall height | 100.8 mm | 107.2 mm | +6.4 |
| Rim diameter | 355.6 mm | 355.6 mm | +0.0 |
| Overall diameter | 557.1 mm | 570.1 mm | +13.0 |
| Circumference | 1,750.2 mm | 1,791.0 mm | +40.8 |
| Revolutions | 571 per km | 558 per km | -13.0 |
Speedometer effect
With 165/65R14 fitted on a car calibrated for 155/65R14, the real speed when the speedometer shows:
| Speedometer shows | Actual speed |
|---|---|
| 50 km/h | 51.2 km/h |
| 80 km/h | 81.9 km/h |
| 100 km/h | 102.3 km/h |
| 120 km/h | 122.8 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 165 mm tire has a manufacturer-specified rim width range.
155/65R14 dimensions · 165/65R14 dimensions · Open in calculator