-0.85%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 235/35R19, fitting 265/30R19 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 39.7 km/h | 25 mph | 25 mph |
| 60 km/h | 59.5 km/h | 37 mph | 37 mph |
| 80 km/h | 79.3 km/h | 50 mph | 49 mph |
| 100 km/h | 99.2 km/h | 62 mph | 62 mph |
| 120 km/h | 119.0 km/h | 75 mph | 74 mph |
Full comparison
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
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
-0.85%Safe swap — speedometer error is minor
Original
Overall diameter647.1 mm · 25.48 in
Sidewall height82.3 mm
Circumference2,032.9 mm
Revolutions / mile791.6
New
Overall diameter641.6 mm · 25.26 in
Sidewall height79.5 mm
Circumference2,015.6 mm
Revolutions / mile798.4
Speedometer & odometer error
The new tire changes overall diameter by -0.85%. 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 | 39.7 km/h | 25 mph | 25 mph |
| 60 km/h | 59.5 km/h | 37 mph | 37 mph |
| 80 km/h | 79.3 km/h | 50 mph | 49 mph |
| 100 km/h | 99.2 km/h | 62 mph | 62 mph |
| 120 km/h | 119 km/h | 75 mph | 74 mph |
See individual specs: 235/35R19 · 265/30R19. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.