Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.91 (810.5) | 33.21 (843.5) | 1.3 (33) 4.1% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 100.25 (2546.26) | 104.33 (2649.93) | 4.08 (103.67) 4.1% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 6.6 (167.75) | 0.65 (16.5) 10.9% |
| Revolutions per mile (km) | 632.04 (392.73) | 607.31 (377.37) | -24.73 (-15.36) -3.9% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.81 mph (33.5 km/h) |
| 25 mph (40.23 km/h) | 26.02 mph (41.87 km/h) |
| 30 mph (48.28 km/h) | 31.22 mph (50.25 km/h) |
| 35 mph (56.33 km/h) | 36.43 mph (58.62 km/h) |
| 40 mph (64.37 km/h) | 41.63 mph (66.99 km/h) |
| 45 mph (72.42 km/h) | 46.83 mph (75.37 km/h) |
| 50 mph (80.47 km/h) | 52.04 mph (83.74 km/h) |
| 55 mph (88.51 km/h) | 57.24 mph (92.12 km/h) |
| 60 mph (96.56 km/h) | 62.44 mph (100.49 km/h) |
| 65 mph (104.61 km/h) | 67.65 mph (108.87 km/h) |
| 70 mph (112.65 km/h) | 72.85 mph (117.24 km/h) |
| 75 mph (120.7 km/h) | 78.05 mph (125.62 km/h) |
| 80 mph (128.75 km/h) | 83.26 mph (133.99 km/h) |
| 85 mph (136.79 km/h) | 88.46 mph (142.36 km/h) |
| 90 mph (144.84 km/h) | 93.66 mph (150.74 km/h) |
| 95 mph (152.89 km/h) | 98.87 mph (159.11 km/h) |
| 100 mph (160.93 km/h) | 104.07 mph (167.49 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1546 | 1795 | 1934 | 2019 | 2111 | 2177 | 2249 | 2335 | 2453 | 2571 | 2703 | 2808 | 2999 | 3209 | 3374 | 3479 | 3538 | 3755 | 4058 | 4715 |
Better Fuel Economy Factory Ratios Increased Power
