Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 34.83 (884.7) | -1.08 (-27.5) -3% |
| Width inches (mm) | 12.8 (325) | 11.22 (285) | -1.57 (-40) -12.3% |
| Circum. inches (mm) | 112.83 (2865.76) | 109.42 (2779.37) | -3.4 (-86.39) -3% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 8.42 (213.75) | -0.54 (-13.75) -6% |
| Revolutions per mile (km) | 561.58 (348.95) | 579.03 (359.79) | 17.46 (10.85) 3.1% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.4 mph (31.22 km/h) |
| 25 mph (40.23 km/h) | 24.25 mph (39.02 km/h) |
| 30 mph (48.28 km/h) | 29.1 mph (46.82 km/h) |
| 35 mph (56.33 km/h) | 33.94 mph (54.63 km/h) |
| 40 mph (64.37 km/h) | 38.79 mph (62.43 km/h) |
| 45 mph (72.42 km/h) | 43.64 mph (70.24 km/h) |
| 50 mph (80.47 km/h) | 48.49 mph (78.04 km/h) |
| 55 mph (88.51 km/h) | 53.34 mph (85.85 km/h) |
| 60 mph (96.56 km/h) | 58.19 mph (93.65 km/h) |
| 65 mph (104.61 km/h) | 63.04 mph (101.45 km/h) |
| 70 mph (112.65 km/h) | 67.89 mph (109.26 km/h) |
| 75 mph (120.7 km/h) | 72.74 mph (117.06 km/h) |
| 80 mph (128.75 km/h) | 77.59 mph (124.87 km/h) |
| 85 mph (136.79 km/h) | 82.44 mph (132.67 km/h) |
| 90 mph (144.84 km/h) | 87.29 mph (140.47 km/h) |
| 95 mph (152.89 km/h) | 92.14 mph (148.28 km/h) |
| 100 mph (160.93 km/h) | 96.99 mph (156.08 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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