+3.04%Borderline — noticeable speedometer/odometer error
Speedometer error
With a speedometer calibrated to 265/30R19, fitting 255/35R19 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 41.2 km/h | 25 mph | 26 mph |
| 60 km/h | 61.8 km/h | 37 mph | 38 mph |
| 80 km/h | 82.4 km/h | 50 mph | 51 mph |
| 100 km/h | 103.0 km/h | 62 mph | 64 mph |
| 120 km/h | 123.6 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
255/35R19
Overall diameter661.1 mm · 26.03 in
Section width255 mm · 10.04 in
Sidewall height89.3 mm · 3.51 in
Circumference2076.9 mm · 81.8 in
Revolutions per mile775
Revolutions per km481
+3.04%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 diameter661.1 mm · 26.03 in
Sidewall height89.3 mm
Circumference2,076.9 mm
Revolutions / mile774.9
Speedometer & odometer error
The new tire changes overall diameter by +3.04%. 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 | 41.2 km/h | 25 mph | 26 mph |
| 60 km/h | 61.8 km/h | 37 mph | 38 mph |
| 80 km/h | 82.4 km/h | 50 mph | 51 mph |
| 100 km/h | 103 km/h | 62 mph | 64 mph |
| 120 km/h | 123.6 km/h | 75 mph | 77 mph |
See individual specs: 265/30R19 · 255/35R19. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.