Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 185/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 26.01 (660.7) | 0.22 (5.5) 0.8% |
| Width inches (mm) | 7.09 (180) | 7.28 (185) | 0.2 (5) 2.8% |
| Circum. inches (mm) | 81.04 (2058.37) | 81.72 (2075.65) | 0.68 (17.28) 0.8% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.01 (101.75) | 0.11 (2.75) 2.8% |
| Revolutions per mile (km) | 781.85 (485.82) | 775.34 (481.78) | -6.51 (-4.04) -0.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.17 mph (32.46 km/h) |
| 25 mph (40.23 km/h) | 25.21 mph (40.57 km/h) |
| 30 mph (48.28 km/h) | 30.25 mph (48.69 km/h) |
| 35 mph (56.33 km/h) | 35.29 mph (56.8 km/h) |
| 40 mph (64.37 km/h) | 40.34 mph (64.91 km/h) |
| 45 mph (72.42 km/h) | 45.38 mph (73.03 km/h) |
| 50 mph (80.47 km/h) | 50.42 mph (81.14 km/h) |
| 55 mph (88.51 km/h) | 55.46 mph (89.26 km/h) |
| 60 mph (96.56 km/h) | 60.5 mph (97.37 km/h) |
| 65 mph (104.61 km/h) | 65.55 mph (105.49 km/h) |
| 70 mph (112.65 km/h) | 70.59 mph (113.6 km/h) |
| 75 mph (120.7 km/h) | 75.63 mph (121.71 km/h) |
| 80 mph (128.75 km/h) | 80.67 mph (129.83 km/h) |
| 85 mph (136.79 km/h) | 85.71 mph (137.94 km/h) |
| 90 mph (144.84 km/h) | 90.76 mph (146.06 km/h) |
| 95 mph (152.89 km/h) | 95.8 mph (154.17 km/h) |
| 100 mph (160.93 km/h) | 100.84 mph (162.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1973 | 2292 | 2468 | 2578 | 2695 | 2779 | 2871 | 2981 | 3132 | 3283 | 3451 | 3585 | 3829 | 4097 | 4307 | 4442 | 4517 | 4794 | 5180 | 6020 |
Better Fuel Economy Factory Ratios Increased Power
