275/55R17 vs 245/65R17
245/65R17 is a safe swap for 275/55R17 by the usual ±3% rule: the diameter differs by +2.18%.
Speedometer and odometer
With 245/65R17 on a car calibrated for 275/55R17, the speedometer reads 58.7 mph when you're really doing 60, and the odometer under-counts by 2.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.7 mph |
| 45 mph | 46.0 mph |
| 60 mph | 61.3 mph |
| 70 mph | 71.5 mph |
| 80 mph | 81.7 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 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 255/65R17+3.95%
- 275/55R17 vs 235/70R17+3.61%
- 275/55R17 vs 255/65R16+0.49%
Questions
Can I replace 275/55R17 with 245/65R17?
245/65R17 is a safe swap for 275/55R17 by the usual ±3% rule: the diameter differs by +2.18%.
What's the difference between 275/55R17 and 245/65R17?
245/65R17 is 0.63" taller and 30 mm narrower; the sidewall is +0.31". At an indicated 60 mph you'd actually be doing 61.3 mph.
Will 245/65R17 fit on 275/55R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 245 mm tire and the fender clearance.