315/30R19 vs 285/35R19
285/35R19 is a safe swap for 315/30R19 by the usual ±3% rule: the diameter differs by +1.56%.
Speedometer and odometer
With 285/35R19 on a car calibrated for 315/30R19, the speedometer reads 59.1 mph when you're really doing 60, and the odometer under-counts by 1.6%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.5 mph |
| 45 mph | 45.7 mph |
| 60 mph | 60.9 mph |
| 70 mph | 71.1 mph |
| 80 mph | 81.3 mph |
Other sizes close to 315/30R19
- 315/30R19 vs 245/45R18+0.91%
- 315/30R19 vs 235/45R18-0.43%
- 315/30R19 vs 245/45R19+4.69%
- 315/30R19 vs 245/40R19+1.04%
- 315/30R19 vs 235/40R19-0.15%
- 315/30R19 vs 255/40R19+2.23%
- 315/30R19 vs 255/35R19-1.56%
- 315/30R19 vs 275/35R19+0.52%
- 315/30R19 vs 275/40R19+4.62%
- 315/30R19 vs 245/35R19-2.61%
- 315/30R19 vs 225/40R19-1.34%
- 315/30R19 vs 235/35R19-3.65%
Questions
Can I replace 315/30R19 with 285/35R19?
285/35R19 is a safe swap for 315/30R19 by the usual ±3% rule: the diameter differs by +1.56%.
What's the difference between 315/30R19 and 285/35R19?
285/35R19 is 0.41" taller and 30 mm narrower; the sidewall is +0.21". At an indicated 60 mph you'd actually be doing 60.9 mph.
Will 285/35R19 fit on 315/30R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 285 mm tire and the fender clearance.