Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/50-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.01 (813) | 33.21 (843.5) | 1.2 (30.5) 3.8% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 100.56 (2554.11) | 104.33 (2649.93) | 3.77 (95.82) 3.8% |
| Sidewall Height inches (mm) | 6 (152.5) | 6.6 (167.75) | 0.6 (15.25) 10% |
| Revolutions per mile (km) | 630.1 (391.52) | 607.31 (377.37) | -22.78 (-14.16) -3.6% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.75 mph (33.39 km/h) |
| 25 mph (40.23 km/h) | 25.94 mph (41.74 km/h) |
| 30 mph (48.28 km/h) | 31.13 mph (50.09 km/h) |
| 35 mph (56.33 km/h) | 36.31 mph (58.44 km/h) |
| 40 mph (64.37 km/h) | 41.5 mph (66.79 km/h) |
| 45 mph (72.42 km/h) | 46.69 mph (75.14 km/h) |
| 50 mph (80.47 km/h) | 51.88 mph (83.49 km/h) |
| 55 mph (88.51 km/h) | 57.06 mph (91.83 km/h) |
| 60 mph (96.56 km/h) | 62.25 mph (100.18 km/h) |
| 65 mph (104.61 km/h) | 67.44 mph (108.53 km/h) |
| 70 mph (112.65 km/h) | 72.63 mph (116.88 km/h) |
| 75 mph (120.7 km/h) | 77.81 mph (125.23 km/h) |
| 80 mph (128.75 km/h) | 83 mph (133.58 km/h) |
| 85 mph (136.79 km/h) | 88.19 mph (141.93 km/h) |
| 90 mph (144.84 km/h) | 93.38 mph (150.28 km/h) |
| 95 mph (152.89 km/h) | 98.56 mph (158.62 km/h) |
| 100 mph (160.93 km/h) | 103.75 mph (166.97 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
