Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 145/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 27.13 (689.2) | -1.85 (-47) -6.4% |
| Width inches (mm) | 6.1 (155) | 5.71 (145) | -0.39 (-10) -6.5% |
| Circum. inches (mm) | 91.06 (2312.84) | 85.24 (2165.19) | -5.81 (-147.65) -6.4% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 4.57 (116) | -0.93 (-23.5) -16.8% |
| Revolutions per mile (km) | 695.83 (432.37) | 743.28 (461.85) | 47.45 (29.49) 6.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.72 mph (30.13 km/h) |
| 25 mph (40.23 km/h) | 23.4 mph (37.67 km/h) |
| 30 mph (48.28 km/h) | 28.08 mph (45.2 km/h) |
| 35 mph (56.33 km/h) | 32.77 mph (52.73 km/h) |
| 40 mph (64.37 km/h) | 37.45 mph (60.26 km/h) |
| 45 mph (72.42 km/h) | 42.13 mph (67.8 km/h) |
| 50 mph (80.47 km/h) | 46.81 mph (75.33 km/h) |
| 55 mph (88.51 km/h) | 51.49 mph (82.86 km/h) |
| 60 mph (96.56 km/h) | 56.17 mph (90.4 km/h) |
| 65 mph (104.61 km/h) | 60.85 mph (97.93 km/h) |
| 70 mph (112.65 km/h) | 65.53 mph (105.46 km/h) |
| 75 mph (120.7 km/h) | 70.21 mph (113 km/h) |
| 80 mph (128.75 km/h) | 74.89 mph (120.53 km/h) |
| 85 mph (136.79 km/h) | 79.57 mph (128.06 km/h) |
| 90 mph (144.84 km/h) | 84.25 mph (135.59 km/h) |
| 95 mph (152.89 km/h) | 88.94 mph (143.13 km/h) |
| 100 mph (160.93 km/h) | 93.62 mph (150.66 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1892 | 2197 | 2366 | 2471 | 2584 | 2664 | 2753 | 2857 | 3002 | 3147 | 3308 | 3437 | 3670 | 3928 | 4129 | 4258 | 4330 | 4596 | 4966 | 5771 |
Better Fuel Economy Factory Ratios Increased Power
