Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 205/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 26.07 (662.2) | 0.28 (7) 1.1% |
| Width inches (mm) | 7.09 (180) | 8.07 (205) | 0.98 (25) 13.9% |
| Circum. inches (mm) | 81.04 (2058.37) | 81.9 (2080.36) | 0.87 (21.99) 1.1% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.04 (102.5) | 0.14 (3.5) 3.5% |
| Revolutions per mile (km) | 781.85 (485.82) | 773.59 (480.68) | -8.26 (-5.14) -1.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.21 mph (32.53 km/h) |
| 25 mph (40.23 km/h) | 25.27 mph (40.66 km/h) |
| 30 mph (48.28 km/h) | 30.32 mph (48.8 km/h) |
| 35 mph (56.33 km/h) | 35.37 mph (56.93 km/h) |
| 40 mph (64.37 km/h) | 40.43 mph (65.06 km/h) |
| 45 mph (72.42 km/h) | 45.48 mph (73.19 km/h) |
| 50 mph (80.47 km/h) | 50.53 mph (81.33 km/h) |
| 55 mph (88.51 km/h) | 55.59 mph (89.46 km/h) |
| 60 mph (96.56 km/h) | 60.64 mph (97.59 km/h) |
| 65 mph (104.61 km/h) | 65.69 mph (105.73 km/h) |
| 70 mph (112.65 km/h) | 70.75 mph (113.86 km/h) |
| 75 mph (120.7 km/h) | 75.8 mph (121.99 km/h) |
| 80 mph (128.75 km/h) | 80.85 mph (130.12 km/h) |
| 85 mph (136.79 km/h) | 85.91 mph (138.26 km/h) |
| 90 mph (144.84 km/h) | 90.96 mph (146.39 km/h) |
| 95 mph (152.89 km/h) | 96.01 mph (154.52 km/h) |
| 100 mph (160.93 km/h) | 101.07 mph (162.65 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1969 | 2287 | 2463 | 2572 | 2689 | 2773 | 2865 | 2974 | 3125 | 3275 | 3443 | 3577 | 3820 | 4088 | 4297 | 4432 | 4507 | 4783 | 5169 | 6006 |
Better Fuel Economy Factory Ratios Increased Power
