Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 305/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 37.21 (945.2) | 10.08 (256) 37.1% |
| Width inches (mm) | 5.71 (145) | 12.01 (305) | 6.3 (160) 110.3% |
| Circum. inches (mm) | 85.24 (2165.19) | 116.91 (2969.43) | 31.66 (804.25) 37.1% |
| Sidewall Height inches (mm) | 4.57 (116) | 9.61 (244) | 5.04 (128) 110.3% |
| Revolutions per mile (km) | 743.28 (461.85) | 541.97 (336.76) | -201.31 (-125.09) -27.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.43 mph (44.14 km/h) |
| 25 mph (40.23 km/h) | 34.29 mph (55.18 km/h) |
| 30 mph (48.28 km/h) | 41.14 mph (66.21 km/h) |
| 35 mph (56.33 km/h) | 48 mph (77.25 km/h) |
| 40 mph (64.37 km/h) | 54.86 mph (88.29 km/h) |
| 45 mph (72.42 km/h) | 61.72 mph (99.32 km/h) |
| 50 mph (80.47 km/h) | 68.57 mph (110.36 km/h) |
| 55 mph (88.51 km/h) | 75.43 mph (121.39 km/h) |
| 60 mph (96.56 km/h) | 82.29 mph (132.43 km/h) |
| 65 mph (104.61 km/h) | 89.14 mph (143.46 km/h) |
| 70 mph (112.65 km/h) | 96 mph (154.5 km/h) |
| 75 mph (120.7 km/h) | 102.86 mph (165.53 km/h) |
| 80 mph (128.75 km/h) | 109.72 mph (176.57 km/h) |
| 85 mph (136.79 km/h) | 116.57 mph (187.61 km/h) |
| 90 mph (144.84 km/h) | 123.43 mph (198.64 km/h) |
| 95 mph (152.89 km/h) | 130.29 mph (209.68 km/h) |
| 100 mph (160.93 km/h) | 137.14 mph (220.71 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1379 | 1602 | 1725 | 1802 | 1884 | 1943 | 2007 | 2083 | 2189 | 2295 | 2412 | 2506 | 2676 | 2864 | 3011 | 3105 | 3158 | 3351 | 3621 | 4208 |
Better Fuel Economy Factory Ratios Increased Power
