235/35R19 vs 305/30R19
305/30R19 is a safe swap for 235/35R19 by the usual ±3% rule: the diameter differs by +2.86%.
Speedometer and odometer
With 305/30R19 on a car calibrated for 235/35R19, the speedometer reads 58.3 mph when you're really doing 60, and the odometer under-counts by 2.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.9 mph |
| 45 mph | 46.3 mph |
| 60 mph | 61.7 mph |
| 70 mph | 72.0 mph |
| 80 mph | 82.3 mph |
Other sizes close to 235/35R19
- 235/35R19 vs 245/40R18+0.94%
- 235/35R19 vs 245/40R19+4.87%
- 235/35R19 vs 235/40R18-0.29%
- 235/35R19 vs 235/40R19+3.63%
- 235/35R19 vs 255/35R19+2.16%
- 235/35R19 vs 275/35R19+4.33%
- 235/35R19 vs 245/35R19+1.08%
- 235/35R19 vs 225/40R19+2.40%
- 235/35R19 vs 275/35R18+0.40%
- 235/35R19 vs 265/35R18-0.68%
- 235/35R19 vs 265/35R19+3.25%
- 235/35R19 vs 215/45R18+0.56%
Questions
Can I replace 235/35R19 with 305/30R19?
305/30R19 is a safe swap for 235/35R19 by the usual ±3% rule: the diameter differs by +2.86%.
What's the difference between 235/35R19 and 305/30R19?
305/30R19 is 0.73" taller and 70 mm wider; the sidewall is +0.36". At an indicated 60 mph you'd actually be doing 61.7 mph.
Will 305/30R19 fit on 235/35R19 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.