265/50R20 vs 275/55R20 Side-by-side tire size comparison with specs and compatibility
This tire swap is between 3-5% diameter difference. Check for fender clearance and be aware of speedometer error. May require recalibration.
Full Specifications Comparison
| Specification | 265/50R20 | 275/55R20 | Difference |
|---|---|---|---|
| Overall Diameter | 773 mm (30.4") | 810.5 mm (31.9") | +37.5 mm |
| Section Width | 265 mm (10.4") | 275 mm (10.8") | +10 mm |
| Sidewall Height | 132.5 mm | 151.3 mm | +18.8 mm |
| Circumference | 2428.5 mm | 2546.3 mm | +117.8 mm |
| Revolutions/Mile | 663 | 632 | -31 |
| Aspect Ratio | 50% | 55% | +5% |
| Rim Diameter | 20" | 20" | 0" |
Key Impact Summary
Speedometer Correction Table
When switching from 265/50R20 to 275/55R20, your speedometer will under-read. Here is the correction at common speeds:
| Speedometer Shows | Actual Speed (mph) | Difference |
|---|---|---|
| 30 mph | 31.5 mph | +1.5 mph |
| 40 mph | 41.9 mph | +1.9 mph |
| 50 mph | 52.4 mph | +2.4 mph |
| 60 mph | 62.9 mph | +2.9 mph |
| 70 mph | 73.4 mph | +3.4 mph |
| 80 mph | 83.9 mph | +3.9 mph |
| 90 mph | 94.4 mph | +4.4 mph |
| 100 mph | 104.9 mph | +4.9 mph |
| 110 mph | 115.3 mph | +5.3 mph |
| 120 mph | 125.8 mph | +5.8 mph |
What This Swap Means
Wider tires (275/55R20): The 10mm wider contact patch provides better grip in dry conditions and improved cornering stability. However, wider tires increase rolling resistance slightly, which may affect fuel economy by 1-2%. They are also more susceptible to hydroplaning in wet conditions.
Taller sidewall: The 18.8mm increase in sidewall height provides a more comfortable ride by absorbing more road imperfections. Taller sidewalls also offer better protection against pothole damage to wheels. The trade-off is slightly less responsive steering feel.
Ground clearance: Increases by 18.8mm, providing slightly better approach angles for off-road driving and speed bump clearance.