-0.31%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 265/65R17, fitting 245/75R16 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 39.9 km/h | 25 mph | 25 mph |
| 60 km/h | 59.8 km/h | 37 mph | 37 mph |
| 80 km/h | 79.8 km/h | 50 mph | 50 mph |
| 100 km/h | 99.7 km/h | 62 mph | 62 mph |
| 120 km/h | 119.6 km/h | 75 mph | 74 mph |
Full comparison
265/65R17
Overall diameter776.3 mm · 30.56 in
Section width265 mm · 10.43 in
Sidewall height172.3 mm · 6.78 in
Circumference2438.8 mm · 96.0 in
Revolutions per mile660
Revolutions per km410
245/75R16
Overall diameter773.9 mm · 30.47 in
Section width245 mm · 9.65 in
Sidewall height183.8 mm · 7.23 in
Circumference2431.3 mm · 95.7 in
Revolutions per mile662
Revolutions per km411
-0.31%Safe swap — speedometer error is minor
Original
Overall diameter776.3 mm · 30.56 in
Sidewall height172.3 mm
Circumference2,438.8 mm
Revolutions / mile659.9
New
Overall diameter773.9 mm · 30.47 in
Sidewall height183.8 mm
Circumference2,431.3 mm
Revolutions / mile661.9
Speedometer & odometer error
The new tire changes overall diameter by -0.31%. 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 | 39.9 km/h | 25 mph | 25 mph |
| 60 km/h | 59.8 km/h | 37 mph | 37 mph |
| 80 km/h | 79.8 km/h | 50 mph | 50 mph |
| 100 km/h | 99.7 km/h | 62 mph | 62 mph |
| 120 km/h | 119.6 km/h | 75 mph | 74 mph |
See individual specs: 265/65R17 · 245/75R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.