The new tire changes overall diameter by -3.13%. 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 | 38.7 km/h | 25 mph | 24 mph |
| 60 km/h | 58.1 km/h | 37 mph | 36 mph |
| 80 km/h | 77.5 km/h | 50 mph | 48 mph |
| 100 km/h | 96.9 km/h | 62 mph | 60 mph |
| 120 km/h | 116.2 km/h | 75 mph | 72 mph |
Commonly compared with 235/55R17
- 235/55R17 vs 215/60R17 · 215/60R17 specs
- 235/55R17 vs 235/60R16 · 235/60R16 specs
- 235/55R17 vs 235/50R18 · 235/50R18 specs
- 235/55R17 vs 255/45R18 · 255/45R18 specs
- 235/55R17 vs 215/65R16 · 215/65R16 specs
- 235/55R17 vs 225/55R17 · 225/55R17 specs
- 235/55R17 vs 245/45R18 · 245/45R18 specs
- 235/55R17 vs 225/60R16 · 225/60R16 specs
FAQ
What is the overall diameter of a 235/55R17 tire?
A 235/55R17 tire has an overall diameter of about 27.18 inches (690 mm) and a section width of 235 mm.
What sizes can replace a 235/55R17 tire?
Sizes within about ±3% of 235/55R17's 27.2-inch diameter are the closest matches, such as 215/60R17, 235/60R16, 235/50R18. Use the calculator above to check the exact speedometer effect of any substitute.
Fitment & trouble codes
Changing tire size by more than about 3% shifts the speedometer, odometer and, on some vehicles, ABS/traction calibration — which can set wheel-speed-sensor or vehicle-speed codes. See C1234 (wheel speed sensor) and C0050 (rear wheel speed) if a warning light appears after a size change.