Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 305/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 34.81 (884.2) | 7.68 (195) 28.3% |
| Width inches (mm) | 5.71 (145) | 12.01 (305) | 6.3 (160) 110.3% |
| Circum. inches (mm) | 85.24 (2165.19) | 109.36 (2777.8) | 24.12 (612.61) 28.3% |
| Sidewall Height inches (mm) | 4.57 (116) | 8.41 (213.5) | 3.84 (97.5) 84.1% |
| Revolutions per mile (km) | 743.28 (461.85) | 579.36 (360) | -163.92 (-101.86) -22.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.66 mph (41.29 km/h) |
| 25 mph (40.23 km/h) | 32.07 mph (51.62 km/h) |
| 30 mph (48.28 km/h) | 38.49 mph (61.94 km/h) |
| 35 mph (56.33 km/h) | 44.9 mph (72.26 km/h) |
| 40 mph (64.37 km/h) | 51.32 mph (82.59 km/h) |
| 45 mph (72.42 km/h) | 57.73 mph (92.91 km/h) |
| 50 mph (80.47 km/h) | 64.15 mph (103.23 km/h) |
| 55 mph (88.51 km/h) | 70.56 mph (113.56 km/h) |
| 60 mph (96.56 km/h) | 76.98 mph (123.88 km/h) |
| 65 mph (104.61 km/h) | 83.39 mph (134.2 km/h) |
| 70 mph (112.65 km/h) | 89.81 mph (144.53 km/h) |
| 75 mph (120.7 km/h) | 96.22 mph (154.85 km/h) |
| 80 mph (128.75 km/h) | 102.63 mph (165.18 km/h) |
| 85 mph (136.79 km/h) | 109.05 mph (175.5 km/h) |
| 90 mph (144.84 km/h) | 115.46 mph (185.82 km/h) |
| 95 mph (152.89 km/h) | 121.88 mph (196.15 km/h) |
| 100 mph (160.93 km/h) | 128.29 mph (206.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1474 | 1713 | 1845 | 1926 | 2014 | 2077 | 2146 | 2227 | 2340 | 2453 | 2579 | 2679 | 2861 | 3062 | 3218 | 3319 | 3375 | 3582 | 3871 | 4498 |
Better Fuel Economy Factory Ratios Increased Power
