Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-20 | 285/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.35 (898) | 33.71 (856.2) | -1.65 (-41.8) -4.7% |
| Width inches (mm) | 12.8 (325) | 11.22 (285) | -1.57 (-40) -12.3% |
| Circum. inches (mm) | 111.07 (2821.15) | 105.9 (2689.83) | -5.17 (-131.32) -4.7% |
| Sidewall Height inches (mm) | 7.68 (195) | 7.85 (199.5) | 0.18 (4.5) 2.3% |
| Revolutions per mile (km) | 570.46 (354.46) | 598.31 (371.77) | 27.85 (17.31) 4.9% |
285/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.07 mph (30.69 km/h) |
| 25 mph (40.23 km/h) | 23.84 mph (38.36 km/h) |
| 30 mph (48.28 km/h) | 28.6 mph (46.03 km/h) |
| 35 mph (56.33 km/h) | 33.37 mph (53.71 km/h) |
| 40 mph (64.37 km/h) | 38.14 mph (61.38 km/h) |
| 45 mph (72.42 km/h) | 42.91 mph (69.05 km/h) |
| 50 mph (80.47 km/h) | 47.67 mph (76.72 km/h) |
| 55 mph (88.51 km/h) | 52.44 mph (84.39 km/h) |
| 60 mph (96.56 km/h) | 57.21 mph (92.07 km/h) |
| 65 mph (104.61 km/h) | 61.97 mph (99.74 km/h) |
| 70 mph (112.65 km/h) | 66.74 mph (107.41 km/h) |
| 75 mph (120.7 km/h) | 71.51 mph (115.08 km/h) |
| 80 mph (128.75 km/h) | 76.28 mph (122.75 km/h) |
| 85 mph (136.79 km/h) | 81.04 mph (130.43 km/h) |
| 90 mph (144.84 km/h) | 85.81 mph (138.1 km/h) |
| 95 mph (152.89 km/h) | 90.58 mph (145.77 km/h) |
| 100 mph (160.93 km/h) | 95.35 mph (153.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1523 | 1769 | 1905 | 1989 | 2080 | 2145 | 2216 | 2300 | 2417 | 2533 | 2663 | 2767 | 2954 | 3162 | 3324 | 3427 | 3486 | 3700 | 3998 | 4645 |
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