+1.99%Safe swap — speedometer error is minor
Speedometer error
With a speedometer calibrated to 185/60R15, fitting 195/60R15 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 40.8 km/h | 25 mph | 25 mph |
| 60 km/h | 61.2 km/h | 37 mph | 38 mph |
| 80 km/h | 81.6 km/h | 50 mph | 51 mph |
| 100 km/h | 102.0 km/h | 62 mph | 63 mph |
| 120 km/h | 122.4 km/h | 75 mph | 76 mph |
Full comparison
185/60R15
Overall diameter603.0 mm · 23.74 in
Section width185 mm · 7.28 in
Sidewall height111.0 mm · 4.37 in
Circumference1894.4 mm · 74.6 in
Revolutions per mile850
Revolutions per km528
195/60R15
Overall diameter615.0 mm · 24.21 in
Section width195 mm · 7.68 in
Sidewall height117.0 mm · 4.61 in
Circumference1932.1 mm · 76.1 in
Revolutions per mile833
Revolutions per km518
+1.99%Safe swap — speedometer error is minor
Original
Overall diameter603 mm · 23.74 in
Sidewall height111 mm
Circumference1,894.4 mm
Revolutions / mile849.5
New
Overall diameter615 mm · 24.21 in
Sidewall height117 mm
Circumference1,932.1 mm
Revolutions / mile833
Speedometer & odometer error
The new tire changes overall diameter by +1.99%. 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 | 40.8 km/h | 25 mph | 25 mph |
| 60 km/h | 61.2 km/h | 37 mph | 38 mph |
| 80 km/h | 81.6 km/h | 50 mph | 51 mph |
| 100 km/h | 102 km/h | 62 mph | 63 mph |
| 120 km/h | 122.4 km/h | 75 mph | 76 mph |
See individual specs: 185/60R15 · 195/60R15. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.