275/45R22 vs 275/50R21
275/50R21 is a safe swap for 275/45R22 by the usual ±3% rule: the diameter differs by +0.26%.
Speedometer and odometer
With 275/50R21 on a car calibrated for 275/45R22, 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 275/45R22
- 275/45R22 vs 285/45R22+1.12%
- 275/45R22 vs 275/50R22+3.41%
- 275/45R22 vs 275/40R22-3.41%
- 275/45R22 vs 265/40R22-4.40%
- 275/45R22 vs 285/40R22-2.42%
- 275/45R22 vs 305/45R22+3.35%
- 275/45R22 vs 33x12.50R22+3.96%
- 275/45R22 vs 305/40R22-0.43%
- 275/45R22 vs 325/35R22-2.48%
- 275/45R22 vs 315/35R22-3.35%
- 275/45R22 vs 295/40R22-1.43%
- 275/45R22 vs 285/50R22+4.65%
Questions
Can I replace 275/45R22 with 275/50R21?
275/50R21 is a safe swap for 275/45R22 by the usual ±3% rule: the diameter differs by +0.26%.
What's the difference between 275/45R22 and 275/50R21?
275/50R21 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 275/50R21 fit on 275/45R22 wheels?
No — 275/45R22 needs a 22" wheel and 275/50R21 a 21" wheel. This is a plus/minus-size swap that changes wheels too.