275/45R20 vs 275/50R19
275/50R19 is a safe swap for 275/45R20 by the usual ±3% rule: the diameter differs by +0.28%.
Speedometer and odometer
With 275/50R19 on a car calibrated for 275/45R20, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.2 mph |
| 80 mph | 80.2 mph |
Other sizes close to 275/45R20
- 275/45R20 vs 245/45R20-3.57%
- 275/45R20 vs 255/45R20-2.38%
- 275/45R20 vs 255/50R20+0.99%
- 275/45R20 vs 275/40R20-3.64%
- 275/45R20 vs 265/50R20+2.32%
- 275/45R20 vs 245/50R20-0.33%
- 275/45R20 vs 255/55R20+4.37%
- 275/45R20 vs 235/55R20+1.46%
- 275/45R20 vs 245/55R19-0.45%
- 275/45R20 vs 265/45R20-1.19%
- 275/45R20 vs 315/35R20-3.57%
- 275/45R20 vs 275/50R20+3.64%
Questions
Can I replace 275/45R20 with 275/50R19?
275/50R19 is a safe swap for 275/45R20 by the usual ±3% rule: the diameter differs by +0.28%.
What's the difference between 275/45R20 and 275/50R19?
275/50R19 is 0.08" taller and 0 mm wider; the sidewall is +0.54". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 275/50R19 fit on 275/45R20 wheels?
No — 275/45R20 needs a 20" wheel and 275/50R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.