Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 175/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 29.02 (737.2) | 1.89 (48) 7% |
| Width inches (mm) | 5.71 (145) | 6.89 (175) | 1.18 (30) 20.7% |
| Circum. inches (mm) | 85.24 (2165.19) | 91.18 (2315.98) | 5.94 (150.8) 7% |
| Sidewall Height inches (mm) | 4.57 (116) | 5.51 (140) | 0.94 (24) 20.7% |
| Revolutions per mile (km) | 743.28 (461.85) | 694.89 (431.78) | -48.4 (-30.07) -6.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.39 mph (34.43 km/h) |
| 25 mph (40.23 km/h) | 26.74 mph (43.04 km/h) |
| 30 mph (48.28 km/h) | 32.09 mph (51.64 km/h) |
| 35 mph (56.33 km/h) | 37.44 mph (60.25 km/h) |
| 40 mph (64.37 km/h) | 42.79 mph (68.86 km/h) |
| 45 mph (72.42 km/h) | 48.13 mph (77.46 km/h) |
| 50 mph (80.47 km/h) | 53.48 mph (86.07 km/h) |
| 55 mph (88.51 km/h) | 58.83 mph (94.68 km/h) |
| 60 mph (96.56 km/h) | 64.18 mph (103.29 km/h) |
| 65 mph (104.61 km/h) | 69.53 mph (111.89 km/h) |
| 70 mph (112.65 km/h) | 74.88 mph (120.5 km/h) |
| 75 mph (120.7 km/h) | 80.22 mph (129.11 km/h) |
| 80 mph (128.75 km/h) | 85.57 mph (137.71 km/h) |
| 85 mph (136.79 km/h) | 90.92 mph (146.32 km/h) |
| 90 mph (144.84 km/h) | 96.27 mph (154.93 km/h) |
| 95 mph (152.89 km/h) | 101.62 mph (163.54 km/h) |
| 100 mph (160.93 km/h) | 106.96 mph (172.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2054 | 2212 | 2310 | 2415 | 2491 | 2574 | 2671 | 2807 | 2942 | 3093 | 3213 | 3431 | 3672 | 3860 | 3981 | 4048 | 4297 | 4643 | 5395 |
Better Fuel Economy Factory Ratios Increased Power
