275/35R18 vs 285/30R19
285/30R19 is a safe swap for 275/35R18 by the usual ±3% rule: the diameter differs by +0.60%.
Speedometer and odometer
With 285/30R19 on a car calibrated for 275/35R18, the speedometer reads 59.6 mph when you're really doing 60, and the odometer under-counts by 0.6%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.3 mph |
| 60 mph | 60.4 mph |
| 70 mph | 70.4 mph |
| 80 mph | 80.5 mph |
Other sizes close to 275/35R18
- 275/35R18 vs 245/40R18+0.54%
- 275/35R18 vs 225/45R18+1.54%
- 275/35R18 vs 225/40R18-1.92%
- 275/35R18 vs 245/45R18+4.31%
- 275/35R18 vs 235/45R18+2.92%
- 275/35R18 vs 235/40R18-0.69%
- 275/35R18 vs 215/50R17-0.45%
- 275/35R18 vs 235/45R17-0.99%
- 275/35R18 vs 245/45R17+0.40%
- 275/35R18 vs 255/35R18-2.15%
- 275/35R18 vs 255/40R18+1.77%
- 275/35R18 vs 245/35R19+0.68%
Questions
Can I replace 275/35R18 with 285/30R19?
285/30R19 is a safe swap for 275/35R18 by the usual ±3% rule: the diameter differs by +0.60%.
What's the difference between 275/35R18 and 285/30R19?
285/30R19 is 0.15" taller and 10 mm wider; the sidewall is -0.42". At an indicated 60 mph you'd actually be doing 60.4 mph.
Will 285/30R19 fit on 275/35R18 wheels?
No — 275/35R18 needs a 18" wheel and 285/30R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.