255/70R17 vs 275/70R17
275/70R17 is outside the ±3% rule as a replacement for 255/70R17: the diameter differs by +3.55%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 275/70R17 on a car calibrated for 255/70R17, the speedometer reads 57.9 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 255/70R17
- 255/70R17 vs 265/70R17+1.77%
- 255/70R17 vs 245/70R17-1.77%
- 255/70R17 vs 245/65R17-4.88%
- 255/70R17 vs 245/75R17+1.33%
- 255/70R17 vs 265/65R17-1.58%
- 255/70R17 vs 235/80R17+2.41%
- 255/70R17 vs 255/65R18-0.01%
- 255/70R17 vs 255/65R17-3.23%
- 255/70R17 vs 255/75R17+3.23%
- 255/70R17 vs 235/75R17-0.57%
- 255/70R17 vs 235/70R17-3.55%
- 255/70R17 vs 275/60R18-0.20%
Questions
Can I replace 255/70R17 with 275/70R17?
275/70R17 is outside the ±3% rule as a replacement for 255/70R17: the diameter differs by +3.55%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/70R17 and 275/70R17?
275/70R17 is 1.10" taller and 20 mm wider; the sidewall is +0.55". At an indicated 60 mph you'd actually be doing 62.1 mph.
Will 275/70R17 fit on 255/70R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 275 mm tire and the fender clearance.