-1.29%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 265/50R20, fitting 255/50R20 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 39.5 km/h | 25 mph | 25 mph |
| 60 km/h | 59.2 km/h | 37 mph | 37 mph |
| 80 km/h | 79.0 km/h | 50 mph | 49 mph |
| 100 km/h | 98.7 km/h | 62 mph | 61 mph |
| 120 km/h | 118.4 km/h | 75 mph | 74 mph |
Full comparison
265/50R20
Overall diameter773.0 mm · 30.43 in
Section width265 mm · 10.43 in
Sidewall height132.5 mm · 5.22 in
Circumference2428.5 mm · 95.6 in
Revolutions per mile663
Revolutions per km412
255/50R20
Overall diameter763.0 mm · 30.04 in
Section width255 mm · 10.04 in
Sidewall height127.5 mm · 5.02 in
Circumference2397.0 mm · 94.4 in
Revolutions per mile671
Revolutions per km417
-1.29%Safe swap — speedometer error is minor
Original
Overall diameter773 mm · 30.43 in
Sidewall height132.5 mm
Circumference2,428.5 mm
Revolutions / mile662.7
New
Overall diameter763 mm · 30.04 in
Sidewall height127.5 mm
Circumference2,397 mm
Revolutions / mile671.4
Speedometer & odometer error
The new tire changes overall diameter by -1.29%. 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 | 39.5 km/h | 25 mph | 25 mph |
| 60 km/h | 59.2 km/h | 37 mph | 37 mph |
| 80 km/h | 79 km/h | 50 mph | 49 mph |
| 100 km/h | 98.7 km/h | 62 mph | 61 mph |
| 120 km/h | 118.4 km/h | 75 mph | 74 mph |
See individual specs: 265/50R20 · 255/50R20. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.