Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 180/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 27.92 (709.2) | 1.93 (49) 7.4% |
| Width inches (mm) | 5.71 (145) | 7.09 (180) | 1.38 (35) 24.1% |
| Circum. inches (mm) | 81.66 (2074.08) | 87.72 (2228.02) | 6.06 (153.94) 7.4% |
| Sidewall Height inches (mm) | 4 (101.5) | 4.96 (126) | 0.96 (24.5) 24.1% |
| Revolutions per mile (km) | 775.93 (482.14) | 722.32 (448.83) | -53.61 (-33.31) -6.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.48 mph (34.58 km/h) |
| 25 mph (40.23 km/h) | 26.86 mph (43.22 km/h) |
| 30 mph (48.28 km/h) | 32.23 mph (51.86 km/h) |
| 35 mph (56.33 km/h) | 37.6 mph (60.51 km/h) |
| 40 mph (64.37 km/h) | 42.97 mph (69.15 km/h) |
| 45 mph (72.42 km/h) | 48.34 mph (77.8 km/h) |
| 50 mph (80.47 km/h) | 53.71 mph (86.44 km/h) |
| 55 mph (88.51 km/h) | 59.08 mph (95.08 km/h) |
| 60 mph (96.56 km/h) | 64.45 mph (103.73 km/h) |
| 65 mph (104.61 km/h) | 69.82 mph (112.37 km/h) |
| 70 mph (112.65 km/h) | 75.2 mph (121.02 km/h) |
| 75 mph (120.7 km/h) | 80.57 mph (129.66 km/h) |
| 80 mph (128.75 km/h) | 85.94 mph (138.3 km/h) |
| 85 mph (136.79 km/h) | 91.31 mph (146.95 km/h) |
| 90 mph (144.84 km/h) | 96.68 mph (155.59 km/h) |
| 95 mph (152.89 km/h) | 102.05 mph (164.24 km/h) |
| 100 mph (160.93 km/h) | 107.42 mph (172.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1838 | 2135 | 2300 | 2401 | 2511 | 2589 | 2675 | 2777 | 2918 | 3058 | 3215 | 3340 | 3567 | 3817 | 4013 | 4138 | 4208 | 4466 | 4826 | 5608 |
Better Fuel Economy Factory Ratios Increased Power
