Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 205/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 31.72 (805.7) | 5.69 (144.5) 21.9% |
| Width inches (mm) | 4.72 (120) | 8.07 (205) | 3.35 (85) 70.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 99.65 (2531.18) | 17.87 (453.96) 21.9% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.86 (174.25) | 2.84 (72.25) 70.8% |
| Revolutions per mile (km) | 774.76 (481.41) | 635.81 (395.07) | -138.95 (-86.34) -17.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.37 mph (39.22 km/h) |
| 25 mph (40.23 km/h) | 30.46 mph (49.03 km/h) |
| 30 mph (48.28 km/h) | 36.56 mph (58.83 km/h) |
| 35 mph (56.33 km/h) | 42.65 mph (68.64 km/h) |
| 40 mph (64.37 km/h) | 48.74 mph (78.44 km/h) |
| 45 mph (72.42 km/h) | 54.83 mph (88.25 km/h) |
| 50 mph (80.47 km/h) | 60.93 mph (98.05 km/h) |
| 55 mph (88.51 km/h) | 67.02 mph (107.86 km/h) |
| 60 mph (96.56 km/h) | 73.11 mph (117.66 km/h) |
| 65 mph (104.61 km/h) | 79.21 mph (127.47 km/h) |
| 70 mph (112.65 km/h) | 85.3 mph (137.27 km/h) |
| 75 mph (120.7 km/h) | 91.39 mph (147.08 km/h) |
| 80 mph (128.75 km/h) | 97.48 mph (156.88 km/h) |
| 85 mph (136.79 km/h) | 103.58 mph (166.69 km/h) |
| 90 mph (144.84 km/h) | 109.67 mph (176.5 km/h) |
| 95 mph (152.89 km/h) | 115.76 mph (186.3 km/h) |
| 100 mph (160.93 km/h) | 121.85 mph (196.11 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1618 | 1880 | 2024 | 2114 | 2210 | 2279 | 2355 | 2444 | 2568 | 2692 | 2830 | 2940 | 3140 | 3360 | 3532 | 3642 | 3704 | 3931 | 4248 | 4937 |
Better Fuel Economy Factory Ratios Increased Power
