+5.99%Not recommended — recalibrate the speedometer
Speedometer error
With a speedometer calibrated to 235/75R15, fitting 265/70R16 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 42.4 km/h | 25 mph | 26 mph |
| 60 km/h | 63.6 km/h | 37 mph | 40 mph |
| 80 km/h | 84.8 km/h | 50 mph | 53 mph |
| 100 km/h | 106.0 km/h | 62 mph | 66 mph |
| 120 km/h | 127.2 km/h | 75 mph | 79 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
265/70R16
Overall diameter777.4 mm · 30.61 in
Section width265 mm · 10.43 in
Sidewall height185.5 mm · 7.30 in
Circumference2442.3 mm · 96.2 in
Revolutions per mile659
Revolutions per km409
+5.99%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 diameter777.4 mm · 30.61 in
Sidewall height185.5 mm
Circumference2,442.3 mm
Revolutions / mile659
Speedometer & odometer error
The new tire changes overall diameter by +5.99%. 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 | 42.4 km/h | 25 mph | 26 mph |
| 60 km/h | 63.6 km/h | 37 mph | 40 mph |
| 80 km/h | 84.8 km/h | 50 mph | 53 mph |
| 100 km/h | 106 km/h | 62 mph | 66 mph |
| 120 km/h | 127.2 km/h | 75 mph | 79 mph |
See individual specs: 235/75R15 · 265/70R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.