295/40R19 vs 305/35R20
305/35R20 is a safe swap for 295/40R19 by the usual ±3% rule: the diameter differs by +0.40%.
Speedometer and odometer
With 305/35R20 on a car calibrated for 295/40R19, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.2 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.3 mph |
| 80 mph | 80.3 mph |
Other sizes close to 295/40R19
- 295/40R19 vs 235/55R19+3.13%
- 295/40R19 vs 235/55R18-0.40%
- 295/40R19 vs 245/45R19-2.16%
- 295/40R19 vs 255/50R19+2.64%
- 295/40R19 vs 255/40R19-4.45%
- 295/40R19 vs 255/45R19-0.90%
- 295/40R19 vs 225/55R19+1.60%
- 295/40R19 vs 275/40R19-2.23%
- 295/40R19 vs 255/40R20-0.92%
- 295/40R19 vs 225/45R19-4.66%
- 295/40R19 vs 235/50R19-0.14%
- 295/40R19 vs 245/55R19+4.66%
Questions
Can I replace 295/40R19 with 305/35R20?
305/35R20 is a safe swap for 295/40R19 by the usual ±3% rule: the diameter differs by +0.40%.
What's the difference between 295/40R19 and 305/35R20?
305/35R20 is 0.11" taller and 10 mm wider; the sidewall is -0.44". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 305/35R20 fit on 295/40R19 wheels?
No — 295/40R19 needs a 19" wheel and 305/35R20 a 20" wheel. This is a plus/minus-size swap that changes wheels too.