285/30R19 vs 315/30R19
315/30R19 is a safe swap for 285/30R19 by the usual ±3% rule: the diameter differs by +2.75%.
Speedometer and odometer
With 315/30R19 on a car calibrated for 285/30R19, the speedometer reads 58.4 mph when you're really doing 60, and the odometer under-counts by 2.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.8 mph |
| 45 mph | 46.2 mph |
| 60 mph | 61.7 mph |
| 70 mph | 71.9 mph |
| 80 mph | 82.2 mph |
Other sizes close to 285/30R19
- 285/30R19 vs 245/40R18-0.06%
- 285/30R19 vs 225/45R18+0.93%
- 285/30R19 vs 245/40R19+3.82%
- 285/30R19 vs 235/40R19+2.60%
- 285/30R19 vs 255/35R19+1.15%
- 285/30R19 vs 275/35R19+3.29%
- 285/30R19 vs 245/35R19+0.08%
- 285/30R19 vs 225/40R19+1.38%
- 285/30R19 vs 235/35R19-0.99%
- 285/30R19 vs 225/45R19+4.82%
- 285/30R19 vs 275/35R18-0.60%
- 285/30R19 vs 285/35R19+4.36%
Questions
Can I replace 285/30R19 with 315/30R19?
315/30R19 is a safe swap for 285/30R19 by the usual ±3% rule: the diameter differs by +2.75%.
What's the difference between 285/30R19 and 315/30R19?
315/30R19 is 0.71" taller and 30 mm wider; the sidewall is +0.35". At an indicated 60 mph you'd actually be doing 61.7 mph.
Will 315/30R19 fit on 285/30R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 315 mm tire and the fender clearance.