205/50R17 vs 275/40R17
275/40R17 is a safe swap for 205/50R17 by the usual ±3% rule: the diameter differs by +2.36%.
Speedometer and odometer
With 275/40R17 on a car calibrated for 205/50R17, the speedometer reads 58.6 mph when you're really doing 60, and the odometer under-counts by 2.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.7 mph |
| 45 mph | 46.1 mph |
| 60 mph | 61.4 mph |
| 70 mph | 71.6 mph |
| 80 mph | 81.9 mph |
Other sizes close to 205/50R17
- 205/50R17 vs 225/45R17-0.39%
- 205/50R17 vs 225/40R18+0.06%
- 205/50R17 vs 225/50R17+3.14%
- 205/50R17 vs 205/55R16-0.77%
- 205/50R17 vs 215/45R17-1.81%
- 205/50R17 vs 215/55R17+4.95%
- 205/50R17 vs 215/50R17+1.57%
- 205/50R17 vs 235/45R17+1.02%
- 205/50R17 vs 245/45R17+2.43%
- 205/50R17 vs 215/55R16+0.96%
- 205/50R17 vs 255/35R18-0.17%
- 205/50R17 vs 245/40R17-1.41%
Questions
Can I replace 205/50R17 with 275/40R17?
275/40R17 is a safe swap for 205/50R17 by the usual ±3% rule: the diameter differs by +2.36%.
What's the difference between 205/50R17 and 275/40R17?
275/40R17 is 0.59" taller and 70 mm wider; the sidewall is +0.30". At an indicated 60 mph you'd actually be doing 61.4 mph.
Will 275/40R17 fit on 205/50R17 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.