Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/55-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.64 (854.5) | 33.21 (843.5) | -0.43 (-11) -1.3% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 105.69 (2684.49) | 104.33 (2649.93) | -1.36 (-34.56) -1.3% |
| Sidewall Height inches (mm) | 6.82 (173.25) | 6.6 (167.75) | -0.22 (-5.5) -3.2% |
| Revolutions per mile (km) | 599.5 (372.51) | 607.31 (377.37) | 7.82 (4.86) 1.3% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.74 mph (31.77 km/h) |
| 25 mph (40.23 km/h) | 24.68 mph (39.72 km/h) |
| 30 mph (48.28 km/h) | 29.61 mph (47.66 km/h) |
| 35 mph (56.33 km/h) | 34.55 mph (55.6 km/h) |
| 40 mph (64.37 km/h) | 39.49 mph (63.55 km/h) |
| 45 mph (72.42 km/h) | 44.42 mph (71.49 km/h) |
| 50 mph (80.47 km/h) | 49.36 mph (79.43 km/h) |
| 55 mph (88.51 km/h) | 54.29 mph (87.37 km/h) |
| 60 mph (96.56 km/h) | 59.23 mph (95.32 km/h) |
| 65 mph (104.61 km/h) | 64.16 mph (103.26 km/h) |
| 70 mph (112.65 km/h) | 69.1 mph (111.2 km/h) |
| 75 mph (120.7 km/h) | 74.03 mph (119.15 km/h) |
| 80 mph (128.75 km/h) | 78.97 mph (127.09 km/h) |
| 85 mph (136.79 km/h) | 83.91 mph (135.03 km/h) |
| 90 mph (144.84 km/h) | 88.84 mph (142.98 km/h) |
| 95 mph (152.89 km/h) | 93.78 mph (150.92 km/h) |
| 100 mph (160.93 km/h) | 98.71 mph (158.86 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
