-1.71%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 275/70R17, fitting 265/70R17 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 39.3 km/h | 25 mph | 24 mph |
| 60 km/h | 59.0 km/h | 37 mph | 37 mph |
| 80 km/h | 78.6 km/h | 50 mph | 49 mph |
| 100 km/h | 98.3 km/h | 62 mph | 61 mph |
| 120 km/h | 117.9 km/h | 75 mph | 73 mph |
Full comparison
275/70R17
Overall diameter816.8 mm · 32.16 in
Section width275 mm · 10.83 in
Sidewall height192.5 mm · 7.58 in
Circumference2566.1 mm · 101.0 in
Revolutions per mile627
Revolutions per km390
265/70R17
Overall diameter802.8 mm · 31.61 in
Section width265 mm · 10.43 in
Sidewall height185.5 mm · 7.30 in
Circumference2522.1 mm · 99.3 in
Revolutions per mile638
Revolutions per km396
-1.71%Safe swap — speedometer error is minor
Original
Overall diameter816.8 mm · 32.16 in
Sidewall height192.5 mm
Circumference2,566.1 mm
Revolutions / mile627.2
New
Overall diameter802.8 mm · 31.61 in
Sidewall height185.5 mm
Circumference2,522.1 mm
Revolutions / mile638.1
Speedometer & odometer error
The new tire changes overall diameter by -1.71%. 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 | 39.3 km/h | 25 mph | 24 mph |
| 60 km/h | 59 km/h | 37 mph | 37 mph |
| 80 km/h | 78.6 km/h | 50 mph | 49 mph |
| 100 km/h | 98.3 km/h | 62 mph | 61 mph |
| 120 km/h | 117.9 km/h | 75 mph | 73 mph |
See individual specs: 275/70R17 · 265/70R17. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.