Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 34.83 (884.7) | 4.43 (112.5) 14.6% |
| Width inches (mm) | 6.89 (175) | 11.22 (285) | 4.33 (110) 62.9% |
| Circum. inches (mm) | 95.51 (2425.94) | 109.42 (2779.37) | 13.91 (353.43) 14.6% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 8.42 (213.75) | 2.21 (56.25) 35.7% |
| Revolutions per mile (km) | 663.39 (412.21) | 579.03 (359.79) | -84.36 (-52.42) -12.7% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.91 mph (36.88 km/h) |
| 25 mph (40.23 km/h) | 28.64 mph (46.1 km/h) |
| 30 mph (48.28 km/h) | 34.37 mph (55.31 km/h) |
| 35 mph (56.33 km/h) | 40.1 mph (64.53 km/h) |
| 40 mph (64.37 km/h) | 45.83 mph (73.75 km/h) |
| 45 mph (72.42 km/h) | 51.56 mph (82.97 km/h) |
| 50 mph (80.47 km/h) | 57.28 mph (92.19 km/h) |
| 55 mph (88.51 km/h) | 63.01 mph (101.41 km/h) |
| 60 mph (96.56 km/h) | 68.74 mph (110.63 km/h) |
| 65 mph (104.61 km/h) | 74.47 mph (119.85 km/h) |
| 70 mph (112.65 km/h) | 80.2 mph (129.07 km/h) |
| 75 mph (120.7 km/h) | 85.93 mph (138.29 km/h) |
| 80 mph (128.75 km/h) | 91.66 mph (147.5 km/h) |
| 85 mph (136.79 km/h) | 97.38 mph (156.72 km/h) |
| 90 mph (144.84 km/h) | 103.11 mph (165.94 km/h) |
| 95 mph (152.89 km/h) | 108.84 mph (175.16 km/h) |
| 100 mph (160.93 km/h) | 114.57 mph (184.38 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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