245/40R19 vs 295/30R20
295/30R20 is a safe swap for 245/40R19 by the usual ±3% rule: the diameter differs by +0.94%.
Speedometer and odometer
With 295/30R20 on a car calibrated for 245/40R19, the speedometer reads 59.4 mph when you're really doing 60, and the odometer under-counts by 0.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.3 mph |
| 45 mph | 45.4 mph |
| 60 mph | 60.6 mph |
| 70 mph | 70.7 mph |
| 80 mph | 80.8 mph |
Other sizes close to 245/40R19
- 245/40R19 vs 245/45R18-0.13%
- 245/40R19 vs 245/45R19+3.61%
- 245/40R19 vs 225/50R18+0.53%
- 245/40R19 vs 235/40R19-1.18%
- 245/40R19 vs 255/40R19+1.18%
- 245/40R19 vs 255/35R19-2.58%
- 245/40R19 vs 255/45R19+4.94%
- 245/40R19 vs 275/35R19-0.52%
- 245/40R19 vs 275/40R19+3.54%
- 245/40R19 vs 245/35R20+0.13%
- 245/40R19 vs 245/35R19-3.61%
- 245/40R19 vs 225/40R19-2.36%
Questions
Can I replace 245/40R19 with 295/30R20?
295/30R20 is a safe swap for 245/40R19 by the usual ±3% rule: the diameter differs by +0.94%.
What's the difference between 245/40R19 and 295/30R20?
295/30R20 is 0.25" taller and 50 mm wider; the sidewall is -0.37". At an indicated 60 mph you'd actually be doing 60.6 mph.
Will 295/30R20 fit on 245/40R19 wheels?
No — 245/40R19 needs a 19" wheel and 295/30R20 a 20" wheel. This is a plus/minus-size swap that changes wheels too.