-2.98%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 265/60R18, fitting 245/55R19 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 38.8 km/h | 25 mph | 24 mph |
| 60 km/h | 58.2 km/h | 37 mph | 36 mph |
| 80 km/h | 77.6 km/h | 50 mph | 48 mph |
| 100 km/h | 97.0 km/h | 62 mph | 60 mph |
| 120 km/h | 116.4 km/h | 75 mph | 72 mph |
Full comparison
265/60R18
Overall diameter775.2 mm · 30.52 in
Section width265 mm · 10.43 in
Sidewall height159.0 mm · 6.26 in
Circumference2435.4 mm · 95.9 in
Revolutions per mile661
Revolutions per km411
245/55R19
Overall diameter752.1 mm · 29.61 in
Section width245 mm · 9.65 in
Sidewall height134.8 mm · 5.31 in
Circumference2362.8 mm · 93.0 in
Revolutions per mile681
Revolutions per km423
-2.98%Safe swap — speedometer error is minor
Original
Overall diameter775.2 mm · 30.52 in
Sidewall height159 mm
Circumference2,435.4 mm
Revolutions / mile660.8
New
Overall diameter752.1 mm · 29.61 in
Sidewall height134.8 mm
Circumference2,362.8 mm
Revolutions / mile681.1
Speedometer & odometer error
The new tire changes overall diameter by -2.98%. 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 | 38.8 km/h | 25 mph | 24 mph |
| 60 km/h | 58.2 km/h | 37 mph | 36 mph |
| 80 km/h | 77.6 km/h | 50 mph | 48 mph |
| 100 km/h | 97 km/h | 62 mph | 60 mph |
| 120 km/h | 116.4 km/h | 75 mph | 72 mph |
See individual specs: 265/60R18 · 245/55R19. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.