235/50R17 vs 235/55R17
235/55R17 is outside the ±3% rule as a replacement for 235/50R17: the diameter differs by +3.52%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 235/55R17 on a car calibrated for 235/50R17, the speedometer reads 58.0 mph when you're really doing 60, and the odometer under-counts by 3.5%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.1 mph |
| 45 mph | 46.6 mph |
| 60 mph | 62.1 mph |
| 70 mph | 72.5 mph |
| 80 mph | 82.8 mph |
Other sizes close to 235/50R17
- 235/50R17 vs 225/45R17-4.87%
- 235/50R17 vs 225/50R17-1.50%
- 235/50R17 vs 225/55R17+1.87%
- 235/50R17 vs 235/45R18+0.28%
- 235/50R17 vs 205/50R17-4.50%
- 235/50R17 vs 215/55R17+0.22%
- 235/50R17 vs 215/50R17-3.00%
- 235/50R17 vs 235/45R17-3.52%
- 235/50R17 vs 245/45R17-2.17%
- 235/50R17 vs 215/60R16-0.36%
- 235/50R17 vs 255/40R18-0.84%
- 235/50R17 vs 215/60R17+3.45%
Questions
Can I replace 235/50R17 with 235/55R17?
235/55R17 is outside the ±3% rule as a replacement for 235/50R17: the diameter differs by +3.52%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 235/50R17 and 235/55R17?
235/55R17 is 0.93" taller and 0 mm wider; the sidewall is +0.46". At an indicated 60 mph you'd actually be doing 62.1 mph.
Will 235/55R17 fit on 235/50R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.