Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-17 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.81 (858.8) | 34.83 (884.7) | 1.02 (25.9) 3% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 106.22 (2698) | 109.42 (2779.37) | 3.2 (81.37) 3% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 8.42 (213.75) | 0.01 (0.25) 0.1% |
| Revolutions per mile (km) | 596.5 (370.64) | 579.03 (359.79) | -17.46 (-10.85) -2.9% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.6 mph (33.16 km/h) |
| 25 mph (40.23 km/h) | 25.75 mph (41.45 km/h) |
| 30 mph (48.28 km/h) | 30.9 mph (49.74 km/h) |
| 35 mph (56.33 km/h) | 36.06 mph (58.03 km/h) |
| 40 mph (64.37 km/h) | 41.21 mph (66.32 km/h) |
| 45 mph (72.42 km/h) | 46.36 mph (74.6 km/h) |
| 50 mph (80.47 km/h) | 51.51 mph (82.89 km/h) |
| 55 mph (88.51 km/h) | 56.66 mph (91.18 km/h) |
| 60 mph (96.56 km/h) | 61.81 mph (99.47 km/h) |
| 65 mph (104.61 km/h) | 66.96 mph (107.76 km/h) |
| 70 mph (112.65 km/h) | 72.11 mph (116.05 km/h) |
| 75 mph (120.7 km/h) | 77.26 mph (124.34 km/h) |
| 80 mph (128.75 km/h) | 82.41 mph (132.63 km/h) |
| 85 mph (136.79 km/h) | 87.56 mph (140.92 km/h) |
| 90 mph (144.84 km/h) | 92.71 mph (149.21 km/h) |
| 95 mph (152.89 km/h) | 97.87 mph (157.5 km/h) |
| 100 mph (160.93 km/h) | 103.02 mph (165.79 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
