Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/65-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.21 (691.2) | 34.83 (884.7) | 7.62 (193.5) 28% |
| Width inches (mm) | 7.09 (180) | 11.22 (285) | 4.13 (105) 58.3% |
| Circum. inches (mm) | 85.49 (2171.47) | 109.42 (2779.37) | 23.93 (607.9) 28% |
| Sidewall Height inches (mm) | 4.61 (117) | 8.42 (213.75) | 3.81 (96.75) 82.7% |
| Revolutions per mile (km) | 741.13 (460.52) | 579.03 (359.79) | -162.1 (-100.72) -21.9% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.6 mph (41.2 km/h) |
| 25 mph (40.23 km/h) | 32 mph (51.5 km/h) |
| 30 mph (48.28 km/h) | 38.4 mph (61.8 km/h) |
| 35 mph (56.33 km/h) | 44.8 mph (72.1 km/h) |
| 40 mph (64.37 km/h) | 51.2 mph (82.4 km/h) |
| 45 mph (72.42 km/h) | 57.6 mph (92.69 km/h) |
| 50 mph (80.47 km/h) | 64 mph (102.99 km/h) |
| 55 mph (88.51 km/h) | 70.4 mph (113.29 km/h) |
| 60 mph (96.56 km/h) | 76.8 mph (123.59 km/h) |
| 65 mph (104.61 km/h) | 83.2 mph (133.89 km/h) |
| 70 mph (112.65 km/h) | 89.6 mph (144.19 km/h) |
| 75 mph (120.7 km/h) | 96 mph (154.49 km/h) |
| 80 mph (128.75 km/h) | 102.4 mph (164.79 km/h) |
| 85 mph (136.79 km/h) | 108.8 mph (175.09 km/h) |
| 90 mph (144.84 km/h) | 115.2 mph (185.39 km/h) |
| 95 mph (152.89 km/h) | 121.6 mph (195.69 km/h) |
| 100 mph (160.93 km/h) | 127.99 mph (205.99 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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