-3.16%Borderline — noticeable speedometer/odometer error
Speedometer error
With a speedometer calibrated to 265/70R17, fitting 265/70R16 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 38.7 km/h | 25 mph | 24 mph |
| 60 km/h | 58.1 km/h | 37 mph | 36 mph |
| 80 km/h | 77.5 km/h | 50 mph | 48 mph |
| 100 km/h | 96.8 km/h | 62 mph | 60 mph |
| 120 km/h | 116.2 km/h | 75 mph | 72 mph |
Full comparison
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
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
-3.16%Borderline — noticeable speedometer/odometer error
Original
Overall diameter802.8 mm · 31.61 in
Sidewall height185.5 mm
Circumference2,522.1 mm
Revolutions / mile638.1
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 -3.16%. 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 | 38.7 km/h | 25 mph | 24 mph |
| 60 km/h | 58.1 km/h | 37 mph | 36 mph |
| 80 km/h | 77.5 km/h | 50 mph | 48 mph |
| 100 km/h | 96.8 km/h | 62 mph | 60 mph |
| 120 km/h | 116.2 km/h | 75 mph | 72 mph |
See individual specs: 265/70R17 · 265/70R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.