245/35R19 vs 305/30R19
305/30R19 is a safe swap for 245/35R19 by the usual ±3% rule: the diameter differs by +1.76%.
Speedometer and odometer
With 305/30R19 on a car calibrated for 245/35R19, the speedometer reads 59.0 mph when you're really doing 60, and the odometer under-counts by 1.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.5 mph |
| 45 mph | 45.8 mph |
| 60 mph | 61.1 mph |
| 70 mph | 71.2 mph |
| 80 mph | 81.4 mph |
Other sizes close to 245/35R19
- 245/35R19 vs 245/40R18-0.14%
- 245/35R19 vs 225/45R18+0.86%
- 245/35R19 vs 245/40R19+3.75%
- 245/35R19 vs 235/40R19+2.52%
- 245/35R19 vs 255/40R19+4.97%
- 245/35R19 vs 255/35R19+1.07%
- 245/35R19 vs 275/35R19+3.21%
- 245/35R19 vs 225/40R19+1.30%
- 245/35R19 vs 235/35R19-1.07%
- 245/35R19 vs 225/45R19+4.74%
- 245/35R19 vs 275/35R18-0.67%
- 245/35R19 vs 285/35R19+4.28%
Questions
Can I replace 245/35R19 with 305/30R19?
305/30R19 is a safe swap for 245/35R19 by the usual ±3% rule: the diameter differs by +1.76%.
What's the difference between 245/35R19 and 305/30R19?
305/30R19 is 0.45" taller and 60 mm wider; the sidewall is +0.23". At an indicated 60 mph you'd actually be doing 61.1 mph.
Will 305/30R19 fit on 245/35R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 305 mm tire and the fender clearance.