Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/70-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.5 (800.2) | 34.83 (884.7) | 3.33 (84.5) 10.6% |
| Width inches (mm) | 9.65 (245) | 11.22 (285) | 1.57 (40) 16.3% |
| Circum. inches (mm) | 98.97 (2513.9) | 109.42 (2779.37) | 10.45 (265.46) 10.6% |
| Sidewall Height inches (mm) | 6.75 (171.5) | 8.42 (213.75) | 1.66 (42.25) 24.6% |
| Revolutions per mile (km) | 640.18 (397.79) | 579.03 (359.79) | -61.15 (-37.99) -9.6% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.11 mph (35.59 km/h) |
| 25 mph (40.23 km/h) | 27.64 mph (44.48 km/h) |
| 30 mph (48.28 km/h) | 33.17 mph (53.38 km/h) |
| 35 mph (56.33 km/h) | 38.7 mph (62.28 km/h) |
| 40 mph (64.37 km/h) | 44.22 mph (71.17 km/h) |
| 45 mph (72.42 km/h) | 49.75 mph (80.07 km/h) |
| 50 mph (80.47 km/h) | 55.28 mph (88.96 km/h) |
| 55 mph (88.51 km/h) | 60.81 mph (97.86 km/h) |
| 60 mph (96.56 km/h) | 66.34 mph (106.76 km/h) |
| 65 mph (104.61 km/h) | 71.86 mph (115.65 km/h) |
| 70 mph (112.65 km/h) | 77.39 mph (124.55 km/h) |
| 75 mph (120.7 km/h) | 82.92 mph (133.45 km/h) |
| 80 mph (128.75 km/h) | 88.45 mph (142.34 km/h) |
| 85 mph (136.79 km/h) | 93.98 mph (151.24 km/h) |
| 90 mph (144.84 km/h) | 99.5 mph (160.14 km/h) |
| 95 mph (152.89 km/h) | 105.03 mph (169.03 km/h) |
| 100 mph (160.93 km/h) | 110.56 mph (177.93 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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