The new tire changes overall diameter by -8.83%. 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 | 36.5 km/h | 25 mph | 23 mph |
| 60 km/h | 54.7 km/h | 37 mph | 34 mph |
| 80 km/h | 72.9 km/h | 50 mph | 45 mph |
| 100 km/h | 91.2 km/h | 62 mph | 57 mph |
| 120 km/h | 109.4 km/h | 75 mph | 68 mph |
Commonly compared with 235/75R15
- 235/75R15 vs 235/70R16 · 235/70R16 specs
- 235/75R15 vs 225/70R16 · 225/70R16 specs
- 235/75R15 vs 245/70R16 · 245/70R16 specs
- 235/75R15 vs 225/70R15 · 225/70R15 specs
- 235/75R15 vs 245/75R16 · 245/75R16 specs
- 235/75R15 vs 265/70R16 · 265/70R16 specs
- 235/75R15 vs 235/60R16 · 235/60R16 specs
- 235/75R15 vs 215/65R16 · 215/65R16 specs
FAQ
What is the overall diameter of a 235/75R15 tire?
A 235/75R15 tire has an overall diameter of about 28.88 inches (734 mm) and a section width of 235 mm.
What sizes can replace a 235/75R15 tire?
Sizes within about ±3% of 235/75R15's 28.9-inch diameter are the closest matches, such as 235/70R16, 225/70R16, 245/70R16. 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.