Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 290/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 31.42 (798) | 5.43 (137.8) 20.9% |
| Width inches (mm) | 5.71 (145) | 11.42 (290) | 5.71 (145) 100% |
| Circum. inches (mm) | 81.66 (2074.08) | 98.7 (2506.99) | 17.04 (432.91) 20.9% |
| Sidewall Height inches (mm) | 4 (101.5) | 5.71 (145) | 1.71 (43.5) 42.9% |
| Revolutions per mile (km) | 775.93 (482.14) | 641.94 (398.88) | -133.99 (-83.26) -17.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.17 mph (38.91 km/h) |
| 25 mph (40.23 km/h) | 30.22 mph (48.63 km/h) |
| 30 mph (48.28 km/h) | 36.26 mph (58.36 km/h) |
| 35 mph (56.33 km/h) | 42.31 mph (68.08 km/h) |
| 40 mph (64.37 km/h) | 48.35 mph (77.81 km/h) |
| 45 mph (72.42 km/h) | 54.39 mph (87.54 km/h) |
| 50 mph (80.47 km/h) | 60.44 mph (97.26 km/h) |
| 55 mph (88.51 km/h) | 66.48 mph (106.99 km/h) |
| 60 mph (96.56 km/h) | 72.52 mph (116.72 km/h) |
| 65 mph (104.61 km/h) | 78.57 mph (126.44 km/h) |
| 70 mph (112.65 km/h) | 84.61 mph (136.17 km/h) |
| 75 mph (120.7 km/h) | 90.65 mph (145.89 km/h) |
| 80 mph (128.75 km/h) | 96.7 mph (155.62 km/h) |
| 85 mph (136.79 km/h) | 102.74 mph (165.35 km/h) |
| 90 mph (144.84 km/h) | 108.79 mph (175.07 km/h) |
| 95 mph (152.89 km/h) | 114.83 mph (184.8 km/h) |
| 100 mph (160.93 km/h) | 120.87 mph (194.53 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1634 | 1898 | 2044 | 2134 | 2231 | 2301 | 2377 | 2468 | 2593 | 2718 | 2857 | 2968 | 3170 | 3392 | 3566 | 3677 | 3740 | 3969 | 4289 | 4984 |
Better Fuel Economy Factory Ratios Increased Power
