275/45R20 vs 265/50R20
265/50R20 is a safe swap for 275/45R20 by the usual ±3% rule: the diameter differs by +2.32%.
Speedometer and odometer
With 265/50R20 on a car calibrated for 275/45R20, the speedometer reads 58.6 mph when you're really doing 60, and the odometer under-counts by 2.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.7 mph |
| 45 mph | 46.0 mph |
| 60 mph | 61.4 mph |
| 70 mph | 71.6 mph |
| 80 mph | 81.9 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 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%
- 275/45R20 vs 295/40R20-1.52%
Questions
Can I replace 275/45R20 with 265/50R20?
265/50R20 is a safe swap for 275/45R20 by the usual ±3% rule: the diameter differs by +2.32%.
What's the difference between 275/45R20 and 265/50R20?
265/50R20 is 0.69" taller and 10 mm narrower; the sidewall is +0.34". At an indicated 60 mph you'd actually be doing 61.4 mph.
Will 265/50R20 fit on 275/45R20 wheels?
Both use a 20" rim, so the wheel diameter matches; check the wheel's width range for a 265 mm tire and the fender clearance.