Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-18 | 285/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.8) | 33.71 (856.2) | 0.69 (17.4) 2.1% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 103.75 (2635.17) | 105.9 (2689.83) | 2.15 (54.66) 2.1% |
| Sidewall Height inches (mm) | 7.51 (190.8) | 7.85 (199.5) | 0.34 (8.7) 4.6% |
| Revolutions per mile (km) | 610.72 (379.48) | 598.31 (371.77) | -12.41 (-7.71) -2% |
285/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.41 mph (32.85 km/h) |
| 25 mph (40.23 km/h) | 25.52 mph (41.07 km/h) |
| 30 mph (48.28 km/h) | 30.62 mph (49.28 km/h) |
| 35 mph (56.33 km/h) | 35.73 mph (57.5 km/h) |
| 40 mph (64.37 km/h) | 40.83 mph (65.71 km/h) |
| 45 mph (72.42 km/h) | 45.93 mph (73.92 km/h) |
| 50 mph (80.47 km/h) | 51.04 mph (82.14 km/h) |
| 55 mph (88.51 km/h) | 56.14 mph (90.35 km/h) |
| 60 mph (96.56 km/h) | 61.24 mph (98.56 km/h) |
| 65 mph (104.61 km/h) | 66.35 mph (106.78 km/h) |
| 70 mph (112.65 km/h) | 71.45 mph (114.99 km/h) |
| 75 mph (120.7 km/h) | 76.56 mph (123.2 km/h) |
| 80 mph (128.75 km/h) | 81.66 mph (131.42 km/h) |
| 85 mph (136.79 km/h) | 86.76 mph (139.63 km/h) |
| 90 mph (144.84 km/h) | 91.87 mph (147.85 km/h) |
| 95 mph (152.89 km/h) | 96.97 mph (156.06 km/h) |
| 100 mph (160.93 km/h) | 102.07 mph (164.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1523 | 1769 | 1905 | 1989 | 2080 | 2145 | 2216 | 2300 | 2417 | 2533 | 2663 | 2767 | 2954 | 3162 | 3324 | 3427 | 3486 | 3700 | 3998 | 4645 |
Better Fuel Economy Factory Ratios Increased Power
