Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 180/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 27.92 (709.2) | 2.13 (54) 8.2% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 81.04 (2058.37) | 87.72 (2228.02) | 6.68 (169.65) 8.2% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.96 (126) | 1.06 (27) 27.3% |
| Revolutions per mile (km) | 781.85 (485.82) | 722.32 (448.83) | -59.53 (-36.99) -7.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.65 mph (34.84 km/h) |
| 25 mph (40.23 km/h) | 27.06 mph (43.55 km/h) |
| 30 mph (48.28 km/h) | 32.47 mph (52.26 km/h) |
| 35 mph (56.33 km/h) | 37.88 mph (60.97 km/h) |
| 40 mph (64.37 km/h) | 43.3 mph (69.68 km/h) |
| 45 mph (72.42 km/h) | 48.71 mph (78.39 km/h) |
| 50 mph (80.47 km/h) | 54.12 mph (87.1 km/h) |
| 55 mph (88.51 km/h) | 59.53 mph (95.81 km/h) |
| 60 mph (96.56 km/h) | 64.95 mph (104.52 km/h) |
| 65 mph (104.61 km/h) | 70.36 mph (113.23 km/h) |
| 70 mph (112.65 km/h) | 75.77 mph (121.94 km/h) |
| 75 mph (120.7 km/h) | 81.18 mph (130.65 km/h) |
| 80 mph (128.75 km/h) | 86.59 mph (139.36 km/h) |
| 85 mph (136.79 km/h) | 92.01 mph (148.07 km/h) |
| 90 mph (144.84 km/h) | 97.42 mph (156.78 km/h) |
| 95 mph (152.89 km/h) | 102.83 mph (165.49 km/h) |
| 100 mph (160.93 km/h) | 108.24 mph (174.2 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
