+4.79%Borderline — noticeable speedometer/odometer error
Speedometer error
With a speedometer calibrated to 185/60R15, fitting 205/55R16 makes it read as follows:
| Speedo shows | True speed | Speedo shows | True speed |
|---|---|---|---|
| 40 km/h | 41.9 km/h | 25 mph | 26 mph |
| 60 km/h | 62.9 km/h | 37 mph | 39 mph |
| 80 km/h | 83.8 km/h | 50 mph | 52 mph |
| 100 km/h | 104.8 km/h | 62 mph | 65 mph |
| 120 km/h | 125.8 km/h | 75 mph | 78 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
205/55R16
Overall diameter631.9 mm · 24.88 in
Section width205 mm · 8.07 in
Sidewall height112.8 mm · 4.44 in
Circumference1985.2 mm · 78.2 in
Revolutions per mile811
Revolutions per km504
+4.79%Borderline — noticeable speedometer/odometer error
Original
Overall diameter603 mm · 23.74 in
Sidewall height111 mm
Circumference1,894.4 mm
Revolutions / mile849.5
New
Overall diameter631.9 mm · 24.88 in
Sidewall height112.8 mm
Circumference1,985.2 mm
Revolutions / mile810.7
Speedometer & odometer error
The new tire changes overall diameter by +4.79%. 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 | 41.9 km/h | 25 mph | 26 mph |
| 60 km/h | 62.9 km/h | 37 mph | 39 mph |
| 80 km/h | 83.8 km/h | 50 mph | 52 mph |
| 100 km/h | 104.8 km/h | 62 mph | 65 mph |
| 120 km/h | 125.8 km/h | 75 mph | 78 mph |
See individual specs: 185/60R15 · 205/55R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.