225/35R19 vs 305/30R19
305/30R19 is outside the ±3% rule as a replacement for 225/35R19: the diameter differs by +3.98%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 305/30R19 on a car calibrated for 225/35R19, the speedometer reads 57.7 mph when you're really doing 60, and the odometer under-counts by 4.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.8 mph |
| 60 mph | 62.4 mph |
| 70 mph | 72.8 mph |
| 80 mph | 83.2 mph |
Other sizes close to 225/35R19
- 225/35R19 vs 225/40R18-0.45%
- 225/35R19 vs 235/40R18+0.80%
- 225/35R19 vs 235/40R19+4.76%
- 225/35R19 vs 255/35R19+3.28%
- 225/35R19 vs 255/35R18-0.69%
- 225/35R19 vs 245/35R19+2.19%
- 225/35R19 vs 225/40R19+3.52%
- 225/35R19 vs 235/35R19+1.09%
- 225/35R19 vs 265/35R18+0.41%
- 225/35R19 vs 265/35R19+4.37%
- 225/35R19 vs 285/30R19+2.11%
- 225/35R19 vs 255/30R19-0.70%
Questions
Can I replace 225/35R19 with 305/30R19?
305/30R19 is outside the ±3% rule as a replacement for 225/35R19: the diameter differs by +3.98%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 225/35R19 and 305/30R19?
305/30R19 is 1.00" taller and 80 mm wider; the sidewall is +0.50". At an indicated 60 mph you'd actually be doing 62.4 mph.
Will 305/30R19 fit on 225/35R19 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.