Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/75-16 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.47 (773.9) | 33.21 (843.5) | 2.74 (69.6) 9% |
| Width inches (mm) | 9.65 (245) | 12.01 (305) | 2.36 (60) 24.5% |
| Circum. inches (mm) | 95.72 (2431.28) | 104.33 (2649.93) | 8.61 (218.65) 9% |
| Sidewall Height inches (mm) | 7.23 (183.75) | 6.6 (167.75) | -0.63 (-16) -8.7% |
| Revolutions per mile (km) | 661.93 (411.31) | 607.31 (377.37) | -54.62 (-33.94) -8.3% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.8 mph (35.08 km/h) |
| 25 mph (40.23 km/h) | 27.25 mph (43.85 km/h) |
| 30 mph (48.28 km/h) | 32.7 mph (52.62 km/h) |
| 35 mph (56.33 km/h) | 38.15 mph (61.39 km/h) |
| 40 mph (64.37 km/h) | 43.6 mph (70.16 km/h) |
| 45 mph (72.42 km/h) | 49.05 mph (78.93 km/h) |
| 50 mph (80.47 km/h) | 54.5 mph (87.7 km/h) |
| 55 mph (88.51 km/h) | 59.95 mph (96.47 km/h) |
| 60 mph (96.56 km/h) | 65.4 mph (105.24 km/h) |
| 65 mph (104.61 km/h) | 70.85 mph (114.02 km/h) |
| 70 mph (112.65 km/h) | 76.3 mph (122.79 km/h) |
| 75 mph (120.7 km/h) | 81.75 mph (131.56 km/h) |
| 80 mph (128.75 km/h) | 87.19 mph (140.33 km/h) |
| 85 mph (136.79 km/h) | 92.64 mph (149.1 km/h) |
| 90 mph (144.84 km/h) | 98.09 mph (157.87 km/h) |
| 95 mph (152.89 km/h) | 103.54 mph (166.64 km/h) |
| 100 mph (160.93 km/h) | 108.99 mph (175.41 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
