Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.8) | 34.83 (884.7) | 1.81 (45.9) 5.5% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 103.75 (2635.17) | 109.42 (2779.37) | 5.68 (144.2) 5.5% |
| Sidewall Height inches (mm) | 7.51 (190.8) | 8.42 (213.75) | 0.9 (22.95) 12% |
| Revolutions per mile (km) | 610.72 (379.48) | 579.03 (359.79) | -31.69 (-19.69) -5.2% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.09 mph (33.95 km/h) |
| 25 mph (40.23 km/h) | 26.37 mph (42.44 km/h) |
| 30 mph (48.28 km/h) | 31.64 mph (50.92 km/h) |
| 35 mph (56.33 km/h) | 36.92 mph (59.41 km/h) |
| 40 mph (64.37 km/h) | 42.19 mph (67.9 km/h) |
| 45 mph (72.42 km/h) | 47.46 mph (76.38 km/h) |
| 50 mph (80.47 km/h) | 52.74 mph (84.87 km/h) |
| 55 mph (88.51 km/h) | 58.01 mph (93.36 km/h) |
| 60 mph (96.56 km/h) | 63.28 mph (101.84 km/h) |
| 65 mph (104.61 km/h) | 68.56 mph (110.33 km/h) |
| 70 mph (112.65 km/h) | 73.83 mph (118.82 km/h) |
| 75 mph (120.7 km/h) | 79.1 mph (127.31 km/h) |
| 80 mph (128.75 km/h) | 84.38 mph (135.79 km/h) |
| 85 mph (136.79 km/h) | 89.65 mph (144.28 km/h) |
| 90 mph (144.84 km/h) | 94.92 mph (152.77 km/h) |
| 95 mph (152.89 km/h) | 100.2 mph (161.25 km/h) |
| 100 mph (160.93 km/h) | 105.47 mph (169.74 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 |
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