Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 305/50-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 29.01 (736.8) | 1.87 (47.6) 6.9% |
| Width inches (mm) | 5.71 (145) | 12.01 (305) | 6.3 (160) 110.3% |
| Circum. inches (mm) | 85.24 (2165.19) | 91.13 (2314.73) | 5.89 (149.54) 6.9% |
| Sidewall Height inches (mm) | 4.57 (116) | 6 (152.5) | 1.44 (36.5) 31.5% |
| Revolutions per mile (km) | 743.28 (461.85) | 695.26 (432.02) | -48.02 (-29.84) -6.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.38 mph (34.41 km/h) |
| 25 mph (40.23 km/h) | 26.73 mph (43.01 km/h) |
| 30 mph (48.28 km/h) | 32.07 mph (51.61 km/h) |
| 35 mph (56.33 km/h) | 37.42 mph (60.22 km/h) |
| 40 mph (64.37 km/h) | 42.76 mph (68.82 km/h) |
| 45 mph (72.42 km/h) | 48.11 mph (77.42 km/h) |
| 50 mph (80.47 km/h) | 53.45 mph (86.02 km/h) |
| 55 mph (88.51 km/h) | 58.8 mph (94.63 km/h) |
| 60 mph (96.56 km/h) | 64.14 mph (103.23 km/h) |
| 65 mph (104.61 km/h) | 69.49 mph (111.83 km/h) |
| 70 mph (112.65 km/h) | 74.83 mph (120.43 km/h) |
| 75 mph (120.7 km/h) | 80.18 mph (129.04 km/h) |
| 80 mph (128.75 km/h) | 85.53 mph (137.64 km/h) |
| 85 mph (136.79 km/h) | 90.87 mph (146.24 km/h) |
| 90 mph (144.84 km/h) | 96.22 mph (154.84 km/h) |
| 95 mph (152.89 km/h) | 101.56 mph (163.45 km/h) |
| 100 mph (160.93 km/h) | 106.91 mph (172.05 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1769 | 2055 | 2214 | 2311 | 2417 | 2492 | 2575 | 2673 | 2808 | 2944 | 3094 | 3215 | 3433 | 3674 | 3862 | 3983 | 4051 | 4299 | 4645 | 5398 |
Better Fuel Economy Factory Ratios Increased Power
