Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 280/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 36.74 (933.2) | 10.71 (272) 41.1% |
| Width inches (mm) | 4.72 (120) | 11.02 (280) | 6.3 (160) 133.3% |
| Circum. inches (mm) | 81.78 (2077.22) | 115.42 (2931.73) | 33.64 (854.51) 41.1% |
| Sidewall Height inches (mm) | 4.02 (102) | 9.37 (238) | 5.35 (136) 133.3% |
| Revolutions per mile (km) | 774.76 (481.41) | 548.94 (341.09) | -225.82 (-140.32) -29.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 28.23 mph (45.43 km/h) |
| 25 mph (40.23 km/h) | 35.28 mph (56.78 km/h) |
| 30 mph (48.28 km/h) | 42.34 mph (68.14 km/h) |
| 35 mph (56.33 km/h) | 49.4 mph (79.5 km/h) |
| 40 mph (64.37 km/h) | 56.45 mph (90.86 km/h) |
| 45 mph (72.42 km/h) | 63.51 mph (102.21 km/h) |
| 50 mph (80.47 km/h) | 70.57 mph (113.57 km/h) |
| 55 mph (88.51 km/h) | 77.63 mph (124.93 km/h) |
| 60 mph (96.56 km/h) | 84.68 mph (136.28 km/h) |
| 65 mph (104.61 km/h) | 91.74 mph (147.64 km/h) |
| 70 mph (112.65 km/h) | 98.8 mph (159 km/h) |
| 75 mph (120.7 km/h) | 105.85 mph (170.35 km/h) |
| 80 mph (128.75 km/h) | 112.91 mph (181.71 km/h) |
| 85 mph (136.79 km/h) | 119.97 mph (193.07 km/h) |
| 90 mph (144.84 km/h) | 127.02 mph (204.43 km/h) |
| 95 mph (152.89 km/h) | 134.08 mph (215.78 km/h) |
| 100 mph (160.93 km/h) | 141.14 mph (227.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1397 | 1623 | 1748 | 1825 | 1908 | 1968 | 2033 | 2110 | 2217 | 2324 | 2443 | 2538 | 2711 | 2901 | 3050 | 3145 | 3198 | 3394 | 3668 | 4262 |
Better Fuel Economy Factory Ratios Increased Power
