Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/85-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.07 (941.7) | 34.83 (884.7) | -2.24 (-57) -6.1% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 116.47 (2958.44) | 109.42 (2779.37) | -7.05 (-179.07) -6.1% |
| Sidewall Height inches (mm) | 9.54 (242.25) | 8.42 (213.75) | -1.12 (-28.5) -11.8% |
| Revolutions per mile (km) | 543.98 (338.02) | 579.03 (359.79) | 35.05 (21.78) 6.4% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.79 mph (30.24 km/h) |
| 25 mph (40.23 km/h) | 23.49 mph (37.8 km/h) |
| 30 mph (48.28 km/h) | 28.18 mph (45.36 km/h) |
| 35 mph (56.33 km/h) | 32.88 mph (52.92 km/h) |
| 40 mph (64.37 km/h) | 37.58 mph (60.48 km/h) |
| 45 mph (72.42 km/h) | 42.28 mph (68.04 km/h) |
| 50 mph (80.47 km/h) | 46.97 mph (75.6 km/h) |
| 55 mph (88.51 km/h) | 51.67 mph (83.16 km/h) |
| 60 mph (96.56 km/h) | 56.37 mph (90.72 km/h) |
| 65 mph (104.61 km/h) | 61.07 mph (98.28 km/h) |
| 70 mph (112.65 km/h) | 65.76 mph (105.84 km/h) |
| 75 mph (120.7 km/h) | 70.46 mph (113.4 km/h) |
| 80 mph (128.75 km/h) | 75.16 mph (120.95 km/h) |
| 85 mph (136.79 km/h) | 79.86 mph (128.51 km/h) |
| 90 mph (144.84 km/h) | 84.55 mph (136.07 km/h) |
| 95 mph (152.89 km/h) | 89.25 mph (143.63 km/h) |
| 100 mph (160.93 km/h) | 93.95 mph (151.19 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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