-2.87%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 285/60R18, fitting 265/65R17 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 38.9 km/h | 25 mph | 24 mph |
| 60 km/h | 58.3 km/h | 37 mph | 36 mph |
| 80 km/h | 77.7 km/h | 50 mph | 48 mph |
| 100 km/h | 97.1 km/h | 62 mph | 60 mph |
| 120 km/h | 116.6 km/h | 75 mph | 72 mph |
Full comparison
285/60R18
Overall diameter799.2 mm · 31.46 in
Section width285 mm · 11.22 in
Sidewall height171.0 mm · 6.73 in
Circumference2510.8 mm · 98.8 in
Revolutions per mile641
Revolutions per km398
265/65R17
Overall diameter776.3 mm · 30.56 in
Section width265 mm · 10.43 in
Sidewall height172.3 mm · 6.78 in
Circumference2438.8 mm · 96.0 in
Revolutions per mile660
Revolutions per km410
-2.87%Safe swap — speedometer error is minor
Original
Overall diameter799.2 mm · 31.46 in
Sidewall height171 mm
Circumference2,510.8 mm
Revolutions / mile641
New
Overall diameter776.3 mm · 30.56 in
Sidewall height172.3 mm
Circumference2,438.8 mm
Revolutions / mile659.9
Speedometer & odometer error
The new tire changes overall diameter by -2.87%. 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 | 38.9 km/h | 25 mph | 24 mph |
| 60 km/h | 58.3 km/h | 37 mph | 36 mph |
| 80 km/h | 77.7 km/h | 50 mph | 48 mph |
| 100 km/h | 97.1 km/h | 62 mph | 60 mph |
| 120 km/h | 116.6 km/h | 75 mph | 72 mph |
See individual specs: 285/60R18 · 265/65R17. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.