Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 350/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 42.05 (1068) | 14.91 (378.8) 55% |
| Width inches (mm) | 5.71 (145) | 13.78 (350) | 8.07 (205) 141.4% |
| Circum. inches (mm) | 85.24 (2165.19) | 132.1 (3355.22) | 46.85 (1190.04) 55% |
| Sidewall Height inches (mm) | 4.57 (116) | 11.02 (280) | 6.46 (164) 141.4% |
| Revolutions per mile (km) | 743.28 (461.85) | 479.65 (298.04) | -263.63 (-163.81) -35.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 30.99 mph (49.88 km/h) |
| 25 mph (40.23 km/h) | 38.74 mph (62.35 km/h) |
| 30 mph (48.28 km/h) | 46.49 mph (74.82 km/h) |
| 35 mph (56.33 km/h) | 54.24 mph (87.29 km/h) |
| 40 mph (64.37 km/h) | 61.98 mph (99.76 km/h) |
| 45 mph (72.42 km/h) | 69.73 mph (112.22 km/h) |
| 50 mph (80.47 km/h) | 77.48 mph (124.69 km/h) |
| 55 mph (88.51 km/h) | 85.23 mph (137.16 km/h) |
| 60 mph (96.56 km/h) | 92.98 mph (149.63 km/h) |
| 65 mph (104.61 km/h) | 100.73 mph (162.1 km/h) |
| 70 mph (112.65 km/h) | 108.47 mph (174.57 km/h) |
| 75 mph (120.7 km/h) | 116.22 mph (187.04 km/h) |
| 80 mph (128.75 km/h) | 123.97 mph (199.51 km/h) |
| 85 mph (136.79 km/h) | 131.72 mph (211.98 km/h) |
| 90 mph (144.84 km/h) | 139.47 mph (224.45 km/h) |
| 95 mph (152.89 km/h) | 147.21 mph (236.92 km/h) |
| 100 mph (160.93 km/h) | 154.96 mph (249.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1221 | 1418 | 1527 | 1595 | 1667 | 1719 | 1776 | 1844 | 1937 | 2031 | 2135 | 2218 | 2369 | 2535 | 2665 | 2748 | 2794 | 2966 | 3205 | 3724 |
Better Fuel Economy Factory Ratios Increased Power
