Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 280/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 33.43 (849.2) | 7.4 (188) 28.4% |
| Width inches (mm) | 4.72 (120) | 11.02 (280) | 6.3 (160) 133.3% |
| Circum. inches (mm) | 81.78 (2077.22) | 105.03 (2667.84) | 23.25 (590.62) 28.4% |
| Sidewall Height inches (mm) | 4.02 (102) | 7.72 (196) | 3.7 (94) 92.2% |
| Revolutions per mile (km) | 774.76 (481.41) | 603.24 (374.83) | -171.52 (-106.58) -22.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.69 mph (41.34 km/h) |
| 25 mph (40.23 km/h) | 32.11 mph (51.67 km/h) |
| 30 mph (48.28 km/h) | 38.53 mph (62.01 km/h) |
| 35 mph (56.33 km/h) | 44.95 mph (72.34 km/h) |
| 40 mph (64.37 km/h) | 51.37 mph (82.68 km/h) |
| 45 mph (72.42 km/h) | 57.79 mph (93.01 km/h) |
| 50 mph (80.47 km/h) | 64.22 mph (103.35 km/h) |
| 55 mph (88.51 km/h) | 70.64 mph (113.68 km/h) |
| 60 mph (96.56 km/h) | 77.06 mph (124.02 km/h) |
| 65 mph (104.61 km/h) | 83.48 mph (134.35 km/h) |
| 70 mph (112.65 km/h) | 89.9 mph (144.69 km/h) |
| 75 mph (120.7 km/h) | 96.32 mph (155.02 km/h) |
| 80 mph (128.75 km/h) | 102.75 mph (165.35 km/h) |
| 85 mph (136.79 km/h) | 109.17 mph (175.69 km/h) |
| 90 mph (144.84 km/h) | 115.59 mph (186.02 km/h) |
| 95 mph (152.89 km/h) | 122.01 mph (196.36 km/h) |
| 100 mph (160.93 km/h) | 128.43 mph (206.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1535 | 1783 | 1921 | 2005 | 2097 | 2162 | 2234 | 2319 | 2437 | 2554 | 2685 | 2789 | 2979 | 3188 | 3351 | 3456 | 3514 | 3730 | 4031 | 4684 |
Better Fuel Economy Factory Ratios Increased Power
