235/75R17 vs 275/60R18
275/60R18 is a safe swap for 235/75R17 by the usual ±3% rule: the diameter differs by +0.37%.
Speedometer and odometer
With 275/60R18 on a car calibrated for 235/75R17, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.2 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.3 mph |
| 80 mph | 80.3 mph |
Other sizes close to 235/75R17
- 235/75R17 vs 265/70R17+2.36%
- 235/75R17 vs 245/70R17-1.21%
- 235/75R17 vs 245/65R17-4.34%
- 235/75R17 vs 245/75R17+1.91%
- 235/75R17 vs 265/65R17-1.02%
- 235/75R17 vs 265/70R16-0.88%
- 235/75R17 vs 235/80R17+3.00%
- 235/75R17 vs 255/65R18+0.56%
- 235/75R17 vs 255/65R17-2.68%
- 235/75R17 vs 255/70R17+0.57%
- 235/75R17 vs 255/75R17+3.83%
- 235/75R17 vs 275/70R17+4.14%
Questions
Can I replace 235/75R17 with 275/60R18?
275/60R18 is a safe swap for 235/75R17 by the usual ±3% rule: the diameter differs by +0.37%.
What's the difference between 235/75R17 and 275/60R18?
275/60R18 is 0.11" taller and 40 mm wider; the sidewall is -0.44". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 275/60R18 fit on 235/75R17 wheels?
No — 235/75R17 needs a 17" wheel and 275/60R18 a 18" wheel. This is a plus/minus-size swap that changes wheels too.