275/55R17 vs 255/65R17
255/65R17 is outside the ±3% rule as a replacement for 275/55R17: the diameter differs by +3.95%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/65R17 on a car calibrated for 275/55R17, the speedometer reads 57.7 mph when you're really doing 60, and the odometer under-counts by 3.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.8 mph |
| 60 mph | 62.4 mph |
| 70 mph | 72.8 mph |
| 80 mph | 83.2 mph |
Other sizes close to 275/55R17
- 275/55R17 vs 235/60R18+0.67%
- 275/55R17 vs 225/65R17-1.36%
- 275/55R17 vs 235/65R17+0.41%
- 275/55R17 vs 225/60R18-0.97%
- 275/55R17 vs 225/60R17-4.43%
- 275/55R17 vs 245/65R17+2.18%
- 275/55R17 vs 255/55R18+0.46%
- 275/55R17 vs 235/70R16+0.15%
- 275/55R17 vs 235/60R17-2.79%
- 275/55R17 vs 215/65R17-3.13%
- 275/55R17 vs 235/70R17+3.61%
- 275/55R17 vs 255/65R16+0.49%
Questions
Can I replace 275/55R17 with 255/65R17?
255/65R17 is outside the ±3% rule as a replacement for 275/55R17: the diameter differs by +3.95%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 275/55R17 and 255/65R17?
255/65R17 is 1.14" taller and 20 mm narrower; the sidewall is +0.57". At an indicated 60 mph you'd actually be doing 62.4 mph.
Will 255/65R17 fit on 275/55R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 255 mm tire and the fender clearance.