+3.27%Borderline — noticeable speedometer/odometer error
Speedometer error
With a speedometer calibrated to 265/30R19, fitting 225/40R19 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 41.3 km/h | 25 mph | 26 mph |
| 60 km/h | 62.0 km/h | 37 mph | 39 mph |
| 80 km/h | 82.6 km/h | 50 mph | 51 mph |
| 100 km/h | 103.3 km/h | 62 mph | 64 mph |
| 120 km/h | 123.9 km/h | 75 mph | 77 mph |
Full comparison
265/30R19
Overall diameter641.6 mm · 25.26 in
Section width265 mm · 10.43 in
Sidewall height79.5 mm · 3.13 in
Circumference2015.6 mm · 79.4 in
Revolutions per mile798
Revolutions per km496
225/40R19
Overall diameter662.6 mm · 26.09 in
Section width225 mm · 8.86 in
Sidewall height90.0 mm · 3.54 in
Circumference2081.6 mm · 82.0 in
Revolutions per mile773
Revolutions per km480
+3.27%Borderline — noticeable speedometer/odometer error
Original
Overall diameter641.6 mm · 25.26 in
Sidewall height79.5 mm
Circumference2,015.6 mm
Revolutions / mile798.4
New
Overall diameter662.6 mm · 26.09 in
Sidewall height90 mm
Circumference2,081.6 mm
Revolutions / mile773.1
Speedometer & odometer error
The new tire changes overall diameter by +3.27%. 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 | 41.3 km/h | 25 mph | 26 mph |
| 60 km/h | 62 km/h | 37 mph | 39 mph |
| 80 km/h | 82.6 km/h | 50 mph | 51 mph |
| 100 km/h | 103.3 km/h | 62 mph | 64 mph |
| 120 km/h | 123.9 km/h | 75 mph | 77 mph |
See individual specs: 265/30R19 · 225/40R19. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.