275/65R18 vs 275/70R17
275/70R17 is a safe swap for 275/65R18 by the usual ±3% rule: the diameter differs by +0.26%.
Speedometer and odometer
With 275/70R17 on a car calibrated for 275/65R18, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.2 mph |
| 80 mph | 80.2 mph |
Other sizes close to 275/65R18
- 275/65R18 vs 265/60R18-4.85%
- 275/65R18 vs 275/70R18+3.38%
- 275/65R18 vs 265/65R18-1.60%
- 275/65R18 vs 265/70R18+1.66%
- 275/65R18 vs 235/80R17-0.85%
- 275/65R18 vs 255/70R18-0.06%
- 275/65R18 vs 255/65R18-3.19%
- 275/65R18 vs 285/65R18+1.60%
- 275/65R18 vs 255/75R17-0.05%
- 275/65R18 vs 33x12.50R18+2.88%
- 275/65R18 vs 285/60R18-1.90%
- 275/65R18 vs 305/65R18+4.79%
Questions
Can I replace 275/65R18 with 275/70R17?
275/70R17 is a safe swap for 275/65R18 by the usual ±3% rule: the diameter differs by +0.26%.
What's the difference between 275/65R18 and 275/70R17?
275/70R17 is 0.08" taller and 0 mm wider; the sidewall is +0.54". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 275/70R17 fit on 275/65R18 wheels?
No — 275/65R18 needs a 18" wheel and 275/70R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.