+3.73%Borderline — noticeable speedometer/odometer error
Speedometer error
With a speedometer calibrated to 245/75R16, fitting 265/70R17 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 41.5 km/h | 25 mph | 26 mph |
| 60 km/h | 62.2 km/h | 37 mph | 39 mph |
| 80 km/h | 83.0 km/h | 50 mph | 52 mph |
| 100 km/h | 103.7 km/h | 62 mph | 64 mph |
| 120 km/h | 124.5 km/h | 75 mph | 77 mph |
Full comparison
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
265/70R17
Overall diameter802.8 mm · 31.61 in
Section width265 mm · 10.43 in
Sidewall height185.5 mm · 7.30 in
Circumference2522.1 mm · 99.3 in
Revolutions per mile638
Revolutions per km396
+3.73%Borderline — noticeable speedometer/odometer error
Original
Overall diameter773.9 mm · 30.47 in
Sidewall height183.8 mm
Circumference2,431.3 mm
Revolutions / mile661.9
New
Overall diameter802.8 mm · 31.61 in
Sidewall height185.5 mm
Circumference2,522.1 mm
Revolutions / mile638.1
Speedometer & odometer error
The new tire changes overall diameter by +3.73%. 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 | 41.5 km/h | 25 mph | 26 mph |
| 60 km/h | 62.2 km/h | 37 mph | 39 mph |
| 80 km/h | 83 km/h | 50 mph | 52 mph |
| 100 km/h | 103.7 km/h | 62 mph | 64 mph |
| 120 km/h | 124.5 km/h | 75 mph | 77 mph |
See individual specs: 245/75R16 · 265/70R17. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.