Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 34/12.5-18 | 285/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.03 (864.24) | 34.83 (884.7) | 0.81 (20.46) 2.4% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 106.89 (2715.09) | 109.42 (2779.37) | 2.53 (64.28) 2.4% |
| Sidewall Height inches (mm) | 8.01 (203.52) | 8.42 (213.75) | 0.4 (10.23) 5% |
| Revolutions per mile (km) | 592.74 (368.31) | 579.03 (359.79) | -13.71 (-8.52) -2.3% |
285/75-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.47 mph (32.95 km/h) |
| 25 mph (40.23 km/h) | 25.59 mph (41.19 km/h) |
| 30 mph (48.28 km/h) | 30.71 mph (49.42 km/h) |
| 35 mph (56.33 km/h) | 35.83 mph (57.66 km/h) |
| 40 mph (64.37 km/h) | 40.95 mph (65.9 km/h) |
| 45 mph (72.42 km/h) | 46.07 mph (74.14 km/h) |
| 50 mph (80.47 km/h) | 51.18 mph (82.37 km/h) |
| 55 mph (88.51 km/h) | 56.3 mph (90.61 km/h) |
| 60 mph (96.56 km/h) | 61.42 mph (98.85 km/h) |
| 65 mph (104.61 km/h) | 66.54 mph (107.08 km/h) |
| 70 mph (112.65 km/h) | 71.66 mph (115.32 km/h) |
| 75 mph (120.7 km/h) | 76.78 mph (123.56 km/h) |
| 80 mph (128.75 km/h) | 81.89 mph (131.8 km/h) |
| 85 mph (136.79 km/h) | 87.01 mph (140.03 km/h) |
| 90 mph (144.84 km/h) | 92.13 mph (148.27 km/h) |
| 95 mph (152.89 km/h) | 97.25 mph (156.51 km/h) |
| 100 mph (160.93 km/h) | 102.37 mph (164.74 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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