Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/75-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.6 (929.7) | 34.83 (884.7) | -1.77 (-45) -4.8% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 114.99 (2920.74) | 109.42 (2779.37) | -5.57 (-141.37) -4.8% |
| Sidewall Height inches (mm) | 9.3 (236.25) | 8.42 (213.75) | -0.89 (-22.5) -9.5% |
| Revolutions per mile (km) | 551.01 (342.38) | 579.03 (359.79) | 28.03 (17.41) 5.1% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.03 mph (30.63 km/h) |
| 25 mph (40.23 km/h) | 23.79 mph (38.29 km/h) |
| 30 mph (48.28 km/h) | 28.55 mph (45.94 km/h) |
| 35 mph (56.33 km/h) | 33.31 mph (53.6 km/h) |
| 40 mph (64.37 km/h) | 38.06 mph (61.26 km/h) |
| 45 mph (72.42 km/h) | 42.82 mph (68.92 km/h) |
| 50 mph (80.47 km/h) | 47.58 mph (76.57 km/h) |
| 55 mph (88.51 km/h) | 52.34 mph (84.23 km/h) |
| 60 mph (96.56 km/h) | 57.1 mph (91.89 km/h) |
| 65 mph (104.61 km/h) | 61.85 mph (99.54 km/h) |
| 70 mph (112.65 km/h) | 66.61 mph (107.2 km/h) |
| 75 mph (120.7 km/h) | 71.37 mph (114.86 km/h) |
| 80 mph (128.75 km/h) | 76.13 mph (122.52 km/h) |
| 85 mph (136.79 km/h) | 80.89 mph (130.17 km/h) |
| 90 mph (144.84 km/h) | 85.64 mph (137.83 km/h) |
| 95 mph (152.89 km/h) | 90.4 mph (145.49 km/h) |
| 100 mph (160.93 km/h) | 95.16 mph (153.15 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
