Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/65-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.61 (853.7) | 34.83 (884.7) | 1.22 (31) 3.6% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 105.59 (2681.98) | 109.42 (2779.37) | 3.83 (97.39) 3.6% |
| Sidewall Height inches (mm) | 7.81 (198.25) | 8.42 (213.75) | 0.61 (15.5) 7.8% |
| Revolutions per mile (km) | 600.06 (372.86) | 579.03 (359.79) | -21.03 (-13.07) -3.5% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.73 mph (33.36 km/h) |
| 25 mph (40.23 km/h) | 25.91 mph (41.69 km/h) |
| 30 mph (48.28 km/h) | 31.09 mph (50.03 km/h) |
| 35 mph (56.33 km/h) | 36.27 mph (58.37 km/h) |
| 40 mph (64.37 km/h) | 41.45 mph (66.71 km/h) |
| 45 mph (72.42 km/h) | 46.63 mph (75.05 km/h) |
| 50 mph (80.47 km/h) | 51.82 mph (83.39 km/h) |
| 55 mph (88.51 km/h) | 57 mph (91.73 km/h) |
| 60 mph (96.56 km/h) | 62.18 mph (100.07 km/h) |
| 65 mph (104.61 km/h) | 67.36 mph (108.41 km/h) |
| 70 mph (112.65 km/h) | 72.54 mph (116.75 km/h) |
| 75 mph (120.7 km/h) | 77.72 mph (125.08 km/h) |
| 80 mph (128.75 km/h) | 82.91 mph (133.42 km/h) |
| 85 mph (136.79 km/h) | 88.09 mph (141.76 km/h) |
| 90 mph (144.84 km/h) | 93.27 mph (150.1 km/h) |
| 95 mph (152.89 km/h) | 98.45 mph (158.44 km/h) |
| 100 mph (160.93 km/h) | 103.63 mph (166.78 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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