-2.34%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 225/40R19, fitting 235/35R19 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 39.1 km/h | 25 mph | 24 mph |
| 60 km/h | 58.6 km/h | 37 mph | 36 mph |
| 80 km/h | 78.1 km/h | 50 mph | 49 mph |
| 100 km/h | 97.7 km/h | 62 mph | 61 mph |
| 120 km/h | 117.2 km/h | 75 mph | 73 mph |
Full comparison
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
235/35R19
Overall diameter647.1 mm · 25.48 in
Section width235 mm · 9.25 in
Sidewall height82.3 mm · 3.24 in
Circumference2032.9 mm · 80.0 in
Revolutions per mile792
Revolutions per km492
-2.34%Safe swap — speedometer error is minor
Original
Overall diameter662.6 mm · 26.09 in
Sidewall height90 mm
Circumference2,081.6 mm
Revolutions / mile773.1
New
Overall diameter647.1 mm · 25.48 in
Sidewall height82.3 mm
Circumference2,032.9 mm
Revolutions / mile791.6
Speedometer & odometer error
The new tire changes overall diameter by -2.34%. 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 | 39.1 km/h | 25 mph | 24 mph |
| 60 km/h | 58.6 km/h | 37 mph | 36 mph |
| 80 km/h | 78.1 km/h | 50 mph | 49 mph |
| 100 km/h | 97.7 km/h | 62 mph | 61 mph |
| 120 km/h | 117.2 km/h | 75 mph | 73 mph |
See individual specs: 225/40R19 · 235/35R19. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.