Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/11.5-20 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.01 (940.16) | 34.83 (884.7) | -2.18 (-55.46) -5.9% |
| Width inches (mm) | 11.5 (292) | 11.22 (285) | -0.28 (-7) -2.4% |
| Circum. inches (mm) | 116.28 (2953.6) | 109.42 (2779.37) | -6.86 (-174.23) -5.9% |
| Sidewall Height inches (mm) | 8.51 (216.08) | 8.42 (213.75) | -0.09 (-2.33) -1.1% |
| Revolutions per mile (km) | 544.88 (338.57) | 579.03 (359.79) | 34.16 (21.22) 6.3% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.82 mph (30.29 km/h) |
| 25 mph (40.23 km/h) | 23.53 mph (37.86 km/h) |
| 30 mph (48.28 km/h) | 28.23 mph (45.43 km/h) |
| 35 mph (56.33 km/h) | 32.94 mph (53 km/h) |
| 40 mph (64.37 km/h) | 37.64 mph (60.58 km/h) |
| 45 mph (72.42 km/h) | 42.35 mph (68.15 km/h) |
| 50 mph (80.47 km/h) | 47.05 mph (75.72 km/h) |
| 55 mph (88.51 km/h) | 51.76 mph (83.29 km/h) |
| 60 mph (96.56 km/h) | 56.46 mph (90.86 km/h) |
| 65 mph (104.61 km/h) | 61.17 mph (98.44 km/h) |
| 70 mph (112.65 km/h) | 65.87 mph (106.01 km/h) |
| 75 mph (120.7 km/h) | 70.58 mph (113.58 km/h) |
| 80 mph (128.75 km/h) | 75.28 mph (121.15 km/h) |
| 85 mph (136.79 km/h) | 79.99 mph (128.73 km/h) |
| 90 mph (144.84 km/h) | 84.69 mph (136.3 km/h) |
| 95 mph (152.89 km/h) | 89.4 mph (143.87 km/h) |
| 100 mph (160.93 km/h) | 94.1 mph (151.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1474 | 1712 | 1843 | 1925 | 2013 | 2075 | 2144 | 2226 | 2339 | 2452 | 2577 | 2677 | 2859 | 3060 | 3217 | 3317 | 3373 | 3580 | 3869 | 4496 |
Better Fuel Economy Factory Ratios Increased Power
