+3.47%Borderline — noticeable speedometer/odometer error
Speedometer error
With a speedometer calibrated to 225/65R17, fitting 245/70R16 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 | 62.1 km/h | 37 mph | 39 mph |
| 80 km/h | 82.8 km/h | 50 mph | 51 mph |
| 100 km/h | 103.5 km/h | 62 mph | 64 mph |
| 120 km/h | 124.2 km/h | 75 mph | 77 mph |
Full comparison
225/65R17
Overall diameter724.3 mm · 28.52 in
Section width225 mm · 8.86 in
Sidewall height146.3 mm · 5.76 in
Circumference2275.5 mm · 89.6 in
Revolutions per mile707
Revolutions per km439
245/70R16
Overall diameter749.4 mm · 29.50 in
Section width245 mm · 9.65 in
Sidewall height171.5 mm · 6.75 in
Circumference2354.3 mm · 92.7 in
Revolutions per mile684
Revolutions per km425
+3.47%Borderline — noticeable speedometer/odometer error
Original
Overall diameter724.3 mm · 28.52 in
Sidewall height146.3 mm
Circumference2,275.5 mm
Revolutions / mile707.3
New
Overall diameter749.4 mm · 29.5 in
Sidewall height171.5 mm
Circumference2,354.3 mm
Revolutions / mile683.6
Speedometer & odometer error
The new tire changes overall diameter by +3.47%. 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 | 62.1 km/h | 37 mph | 39 mph |
| 80 km/h | 82.8 km/h | 50 mph | 51 mph |
| 100 km/h | 103.5 km/h | 62 mph | 64 mph |
| 120 km/h | 124.2 km/h | 75 mph | 77 mph |
See individual specs: 225/65R17 · 245/70R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.