Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 28/8.25-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 27.94 (709.6) | 1.91 (48.4) 7.3% |
| Width inches (mm) | 4.72 (120) | 8.27 (210) | 3.54 (90) 75% |
| Circum. inches (mm) | 81.78 (2077.22) | 87.77 (2229.27) | 5.99 (152.05) 7.3% |
| Sidewall Height inches (mm) | 4.02 (102) | 3.97 (100.8) | -0.05 (-1.2) -1.2% |
| Revolutions per mile (km) | 774.76 (481.41) | 721.91 (448.58) | -52.84 (-32.84) -6.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.46 mph (34.54 km/h) |
| 25 mph (40.23 km/h) | 26.83 mph (43.18 km/h) |
| 30 mph (48.28 km/h) | 32.2 mph (51.81 km/h) |
| 35 mph (56.33 km/h) | 37.56 mph (60.45 km/h) |
| 40 mph (64.37 km/h) | 42.93 mph (69.09 km/h) |
| 45 mph (72.42 km/h) | 48.29 mph (77.72 km/h) |
| 50 mph (80.47 km/h) | 53.66 mph (86.36 km/h) |
| 55 mph (88.51 km/h) | 59.03 mph (94.99 km/h) |
| 60 mph (96.56 km/h) | 64.39 mph (103.63 km/h) |
| 65 mph (104.61 km/h) | 69.76 mph (112.26 km/h) |
| 70 mph (112.65 km/h) | 75.12 mph (120.9 km/h) |
| 75 mph (120.7 km/h) | 80.49 mph (129.54 km/h) |
| 80 mph (128.75 km/h) | 85.86 mph (138.17 km/h) |
| 85 mph (136.79 km/h) | 91.22 mph (146.81 km/h) |
| 90 mph (144.84 km/h) | 96.59 mph (155.44 km/h) |
| 95 mph (152.89 km/h) | 101.95 mph (164.08 km/h) |
| 100 mph (160.93 km/h) | 107.32 mph (172.72 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1837 | 2134 | 2298 | 2400 | 2509 | 2588 | 2674 | 2775 | 2916 | 3057 | 3213 | 3338 | 3565 | 3815 | 4010 | 4136 | 4206 | 4464 | 4823 | 5605 |
Better Fuel Economy Factory Ratios Increased Power
