Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/12.5-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.03 (940.56) | 34.83 (884.7) | -2.2 (-55.86) -5.9% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 116.33 (2954.86) | 109.42 (2779.37) | -6.91 (-175.49) -5.9% |
| Sidewall Height inches (mm) | 9.51 (241.68) | 8.42 (213.75) | -1.1 (-27.93) -11.6% |
| Revolutions per mile (km) | 544.64 (338.43) | 579.03 (359.79) | 34.39 (21.37) 6.3% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.81 mph (30.28 km/h) |
| 25 mph (40.23 km/h) | 23.52 mph (37.84 km/h) |
| 30 mph (48.28 km/h) | 28.22 mph (45.41 km/h) |
| 35 mph (56.33 km/h) | 32.92 mph (52.98 km/h) |
| 40 mph (64.37 km/h) | 37.62 mph (60.55 km/h) |
| 45 mph (72.42 km/h) | 42.33 mph (68.12 km/h) |
| 50 mph (80.47 km/h) | 47.03 mph (75.69 km/h) |
| 55 mph (88.51 km/h) | 51.73 mph (83.26 km/h) |
| 60 mph (96.56 km/h) | 56.44 mph (90.83 km/h) |
| 65 mph (104.61 km/h) | 61.14 mph (98.39 km/h) |
| 70 mph (112.65 km/h) | 65.84 mph (105.96 km/h) |
| 75 mph (120.7 km/h) | 70.55 mph (113.53 km/h) |
| 80 mph (128.75 km/h) | 75.25 mph (121.1 km/h) |
| 85 mph (136.79 km/h) | 79.95 mph (128.67 km/h) |
| 90 mph (144.84 km/h) | 84.65 mph (136.24 km/h) |
| 95 mph (152.89 km/h) | 89.36 mph (143.81 km/h) |
| 100 mph (160.93 km/h) | 94.06 mph (151.38 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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