Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/55-18 | 205/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.01 (660.7) | 26.07 (662.2) | 0.06 (1.5) 0.2% |
| Width inches (mm) | 7.28 (185) | 8.07 (205) | 0.79 (20) 10.8% |
| Circum. inches (mm) | 81.72 (2075.65) | 81.9 (2080.36) | 0.19 (4.71) 0.2% |
| Sidewall Height inches (mm) | 4.01 (101.75) | 4.04 (102.5) | 0.03 (0.75) 0.7% |
| Revolutions per mile (km) | 775.34 (481.78) | 773.59 (480.68) | -1.76 (-1.09) -0.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.05 mph (32.26 km/h) |
| 25 mph (40.23 km/h) | 25.06 mph (40.33 km/h) |
| 30 mph (48.28 km/h) | 30.07 mph (48.39 km/h) |
| 35 mph (56.33 km/h) | 35.08 mph (56.46 km/h) |
| 40 mph (64.37 km/h) | 40.09 mph (64.52 km/h) |
| 45 mph (72.42 km/h) | 45.1 mph (72.59 km/h) |
| 50 mph (80.47 km/h) | 50.11 mph (80.65 km/h) |
| 55 mph (88.51 km/h) | 55.12 mph (88.72 km/h) |
| 60 mph (96.56 km/h) | 60.14 mph (96.78 km/h) |
| 65 mph (104.61 km/h) | 65.15 mph (104.85 km/h) |
| 70 mph (112.65 km/h) | 70.16 mph (112.91 km/h) |
| 75 mph (120.7 km/h) | 75.17 mph (120.98 km/h) |
| 80 mph (128.75 km/h) | 80.18 mph (129.04 km/h) |
| 85 mph (136.79 km/h) | 85.19 mph (137.11 km/h) |
| 90 mph (144.84 km/h) | 90.2 mph (145.17 km/h) |
| 95 mph (152.89 km/h) | 95.22 mph (153.24 km/h) |
| 100 mph (160.93 km/h) | 100.23 mph (161.3 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
