+3.41%Borderline — noticeable speedometer/odometer error
Speedometer error
With a speedometer calibrated to 265/65R17, fitting 265/70R17 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 41.4 km/h | 25 mph | 26 mph |
| 60 km/h | 62.0 km/h | 37 mph | 39 mph |
| 80 km/h | 82.7 km/h | 50 mph | 51 mph |
| 100 km/h | 103.4 km/h | 62 mph | 64 mph |
| 120 km/h | 124.1 km/h | 75 mph | 77 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
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
+3.41%Borderline — noticeable speedometer/odometer error
Original
Overall diameter776.3 mm · 30.56 in
Sidewall height172.3 mm
Circumference2,438.8 mm
Revolutions / mile659.9
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 +3.41%. 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 | 41.4 km/h | 25 mph | 26 mph |
| 60 km/h | 62 km/h | 37 mph | 39 mph |
| 80 km/h | 82.7 km/h | 50 mph | 51 mph |
| 100 km/h | 103.4 km/h | 62 mph | 64 mph |
| 120 km/h | 124.1 km/h | 75 mph | 77 mph |
See individual specs: 265/65R17 · 265/70R17. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.