275/60R20 vs 275/55R20Tire Size Comparison
The 3.3% diameter difference exceeds 3% and may affect speedometer accuracy.
Comparison Details
Speedometer Correction
When switching from 275/60R20 to 275/55R20, your speedometer will differ from actual speed.
| Speedometer | Actual Speed | Difference |
|---|---|---|
| 30 km/h | 29.0 km/h | -1.0 km/h |
| 40 km/h | 38.7 km/h | -1.3 km/h |
| 50 km/h | 48.4 km/h | -1.6 km/h |
| 60 km/h | 58.0 km/h | -2.0 km/h |
| 70 km/h | 67.7 km/h | -2.3 km/h |
| 80 km/h | 77.4 km/h | -2.6 km/h |
| 90 km/h | 87.0 km/h | -3.0 km/h |
| 100 km/h | 96.7 km/h | -3.3 km/h |
| 110 km/h | 106.4 km/h | -3.6 km/h |
| 120 km/h | 116.1 km/h | -3.9 km/h |
| 130 km/h | 125.7 km/h | -4.3 km/h |
Vehicles Using These Sizes
Vehicles with 275/60R20
Vehicles with 275/55R20
Individual Tire Size Details
Practical Guidance
The 3.3% diameter difference between 275/60R20 and 275/55R20 exceeds the standard 3% tolerance. While physically possible, this change will cause noticeable speedometer error and may affect ABS and traction control calibration. Consult a tire professional before making this switch.
The 3% diameter tolerance is a widely accepted industry guideline referenced by the ETRTO and most vehicle manufacturers. When in doubt, consult your vehicle's owner's manual or a qualified tire professional. For U.S. tire safety standards and recalls, see the NHTSA Tire Safety page.
Frequently Asked Questions
Use Caution. The overall diameter differs by -3.28%, width changes by 0mm.
Speedometer error will be -3.28%. At an indicated 100 km/h, actual speed is about 96.7 km/h.
Ground clearance changes by -13.7mm per side.