-6.49%Not recommended — recalibrate the speedometer
Speedometer error
With a speedometer calibrated to 235/75R15, fitting 215/65R16 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 37.4 km/h | 25 mph | 23 mph |
| 60 km/h | 56.1 km/h | 37 mph | 35 mph |
| 80 km/h | 74.8 km/h | 50 mph | 46 mph |
| 100 km/h | 93.5 km/h | 62 mph | 58 mph |
| 120 km/h | 112.2 km/h | 75 mph | 70 mph |
Full comparison
235/75R15
Overall diameter733.5 mm · 28.88 in
Section width235 mm · 9.25 in
Sidewall height176.3 mm · 6.94 in
Circumference2304.4 mm · 90.7 in
Revolutions per mile698
Revolutions per km434
215/65R16
Overall diameter685.9 mm · 27.00 in
Section width215 mm · 8.46 in
Sidewall height139.8 mm · 5.50 in
Circumference2154.8 mm · 84.8 in
Revolutions per mile747
Revolutions per km464
-6.49%Not recommended — recalibrate the speedometer
Original
Overall diameter733.5 mm · 28.88 in
Sidewall height176.3 mm
Circumference2,304.4 mm
Revolutions / mile698.4
New
Overall diameter685.9 mm · 27 in
Sidewall height139.8 mm
Circumference2,154.8 mm
Revolutions / mile746.9
Speedometer & odometer error
The new tire changes overall diameter by -6.49%. 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 | 37.4 km/h | 25 mph | 23 mph |
| 60 km/h | 56.1 km/h | 37 mph | 35 mph |
| 80 km/h | 74.8 km/h | 50 mph | 46 mph |
| 100 km/h | 93.5 km/h | 62 mph | 58 mph |
| 120 km/h | 112.2 km/h | 75 mph | 70 mph |
See individual specs: 235/75R15 · 215/65R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.