Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 28/9.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 28.06 (712.66) | 2.03 (51.46) 7.8% |
| Width inches (mm) | 4.72 (120) | 9.49 (241) | 4.76 (121) 100.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 88.15 (2238.89) | 6.36 (161.67) 7.8% |
| Sidewall Height inches (mm) | 4.02 (102) | 5.03 (127.73) | 1.01 (25.73) 25.2% |
| Revolutions per mile (km) | 774.76 (481.41) | 718.81 (446.65) | -55.94 (-34.76) -7.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.56 mph (34.69 km/h) |
| 25 mph (40.23 km/h) | 26.95 mph (43.36 km/h) |
| 30 mph (48.28 km/h) | 32.33 mph (52.04 km/h) |
| 35 mph (56.33 km/h) | 37.72 mph (60.71 km/h) |
| 40 mph (64.37 km/h) | 43.11 mph (69.38 km/h) |
| 45 mph (72.42 km/h) | 48.5 mph (78.06 km/h) |
| 50 mph (80.47 km/h) | 53.89 mph (86.73 km/h) |
| 55 mph (88.51 km/h) | 59.28 mph (95.4 km/h) |
| 60 mph (96.56 km/h) | 64.67 mph (104.08 km/h) |
| 65 mph (104.61 km/h) | 70.06 mph (112.75 km/h) |
| 70 mph (112.65 km/h) | 75.45 mph (121.42 km/h) |
| 75 mph (120.7 km/h) | 80.84 mph (130.09 km/h) |
| 80 mph (128.75 km/h) | 86.23 mph (138.77 km/h) |
| 85 mph (136.79 km/h) | 91.62 mph (147.44 km/h) |
| 90 mph (144.84 km/h) | 97 mph (156.11 km/h) |
| 95 mph (152.89 km/h) | 102.39 mph (164.79 km/h) |
| 100 mph (160.93 km/h) | 107.78 mph (173.46 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1829 | 2125 | 2289 | 2390 | 2499 | 2577 | 2662 | 2763 | 2903 | 3044 | 3199 | 3324 | 3550 | 3799 | 3993 | 4118 | 4188 | 4445 | 4803 | 5581 |
Better Fuel Economy Factory Ratios Increased Power
