285/60R18 vs 245/75R17
245/75R17 is a safe swap for 285/60R18 by the usual ±3% rule: the diameter differs by +0.01%.
Speedometer and odometer
With 245/75R17 on a car calibrated for 285/60R18, the speedometer reads 60.0 mph when you're really doing 60, and the odometer under-counts by 0.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.0 mph |
| 45 mph | 45.0 mph |
| 60 mph | 60.0 mph |
| 70 mph | 70.0 mph |
| 80 mph | 80.0 mph |
Other sizes close to 285/60R18
- 285/60R18 vs 265/70R17+0.45%
- 285/60R18 vs 275/65R18+1.94%
- 285/60R18 vs 265/60R18-3.00%
- 285/60R18 vs 265/65R18+0.31%
- 285/60R18 vs 265/70R18+3.63%
- 285/60R18 vs 235/65R18-4.57%
- 285/60R18 vs 255/70R18+1.88%
- 285/60R18 vs 255/65R18-1.31%
- 285/60R18 vs 285/65R18+3.57%
- 285/60R18 vs 255/60R18-4.50%
- 285/60R18 vs 33x12.50R18+4.88%
- 285/60R18 vs 275/60R18-1.50%
Questions
Can I replace 285/60R18 with 245/75R17?
245/75R17 is a safe swap for 285/60R18 by the usual ±3% rule: the diameter differs by +0.01%.
What's the difference between 285/60R18 and 245/75R17?
245/75R17 is 0.00" taller and 40 mm narrower; the sidewall is +0.50". At an indicated 60 mph you'd actually be doing 60.0 mph.
Will 245/75R17 fit on 285/60R18 wheels?
No — 285/60R18 needs a 18" wheel and 245/75R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.