Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/45-18 | 185/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.26 (641.7) | 25.28 (642.2) | 0.02 (0.5) 0.1% |
| Width inches (mm) | 8.07 (205) | 7.28 (185) | -0.79 (-20) -9.8% |
| Circum. inches (mm) | 79.37 (2015.96) | 79.43 (2017.53) | 0.06 (1.57) 0.1% |
| Sidewall Height inches (mm) | 3.63 (92.25) | 3.64 (92.5) | 0.01 (0.25) 0.3% |
| Revolutions per mile (km) | 798.3 (496.04) | 797.68 (495.65) | -0.62 (-0.39) -0.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.02 mph (32.21 km/h) |
| 25 mph (40.23 km/h) | 25.02 mph (40.27 km/h) |
| 30 mph (48.28 km/h) | 30.02 mph (48.32 km/h) |
| 35 mph (56.33 km/h) | 35.03 mph (56.37 km/h) |
| 40 mph (64.37 km/h) | 40.03 mph (64.42 km/h) |
| 45 mph (72.42 km/h) | 45.04 mph (72.48 km/h) |
| 50 mph (80.47 km/h) | 50.04 mph (80.53 km/h) |
| 55 mph (88.51 km/h) | 55.04 mph (88.58 km/h) |
| 60 mph (96.56 km/h) | 60.05 mph (96.64 km/h) |
| 65 mph (104.61 km/h) | 65.05 mph (104.69 km/h) |
| 70 mph (112.65 km/h) | 70.05 mph (112.74 km/h) |
| 75 mph (120.7 km/h) | 75.06 mph (120.8 km/h) |
| 80 mph (128.75 km/h) | 80.06 mph (128.85 km/h) |
| 85 mph (136.79 km/h) | 85.07 mph (136.9 km/h) |
| 90 mph (144.84 km/h) | 90.07 mph (144.95 km/h) |
| 95 mph (152.89 km/h) | 95.07 mph (153.01 km/h) |
| 100 mph (160.93 km/h) | 100.08 mph (161.06 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2030 | 2358 | 2540 | 2652 | 2773 | 2859 | 2954 | 3067 | 3222 | 3377 | 3550 | 3688 | 3939 | 4215 | 4431 | 4570 | 4647 | 4932 | 5330 | 6193 |
Better Fuel Economy Factory Ratios Increased Power
