225/60R18 vs 275/55R17
275/55R17 is a safe swap for 225/60R18 by the usual ±3% rule: the diameter differs by +0.98%.
Speedometer and odometer
With 275/55R17 on a car calibrated for 225/60R18, the speedometer reads 59.4 mph when you're really doing 60, and the odometer under-counts by 1.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.3 mph |
| 45 mph | 45.4 mph |
| 60 mph | 60.6 mph |
| 70 mph | 70.7 mph |
| 80 mph | 80.8 mph |
Other sizes close to 225/60R18
- 225/60R18 vs 235/60R18+1.65%
- 225/60R18 vs 225/65R17-0.40%
- 225/60R18 vs 235/50R18-4.81%
- 225/60R18 vs 235/55R18-1.58%
- 225/60R18 vs 245/60R18+3.30%
- 225/60R18 vs 225/55R18-3.09%
- 225/60R18 vs 255/55R18+1.44%
- 225/60R18 vs 235/65R18+4.88%
- 225/60R18 vs 225/55R19+0.40%
- 225/60R18 vs 245/50R18-3.44%
- 225/60R18 vs 215/55R18-4.61%
- 225/60R18 vs 245/50R19+0.06%
Questions
Can I replace 225/60R18 with 275/55R17?
275/55R17 is a safe swap for 225/60R18 by the usual ±3% rule: the diameter differs by +0.98%.
What's the difference between 225/60R18 and 275/55R17?
275/55R17 is 0.28" taller and 50 mm wider; the sidewall is +0.64". At an indicated 60 mph you'd actually be doing 60.6 mph.
Will 275/55R17 fit on 225/60R18 wheels?
No — 225/60R18 needs a 18" wheel and 275/55R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.