Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 34/12.5-18 | 285/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.03 (864.24) | 33.71 (856.2) | -0.32 (-8.04) -0.9% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 106.89 (2715.09) | 105.9 (2689.83) | -0.99 (-25.26) -0.9% |
| Sidewall Height inches (mm) | 8.01 (203.52) | 7.85 (199.5) | -0.16 (-4.02) -2% |
| Revolutions per mile (km) | 592.74 (368.31) | 598.31 (371.77) | 5.57 (3.46) 0.9% |
285/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.81 mph (31.89 km/h) |
| 25 mph (40.23 km/h) | 24.77 mph (39.86 km/h) |
| 30 mph (48.28 km/h) | 29.72 mph (47.83 km/h) |
| 35 mph (56.33 km/h) | 34.67 mph (55.8 km/h) |
| 40 mph (64.37 km/h) | 39.63 mph (63.78 km/h) |
| 45 mph (72.42 km/h) | 44.58 mph (71.75 km/h) |
| 50 mph (80.47 km/h) | 49.53 mph (79.72 km/h) |
| 55 mph (88.51 km/h) | 54.49 mph (87.69 km/h) |
| 60 mph (96.56 km/h) | 59.44 mph (95.66 km/h) |
| 65 mph (104.61 km/h) | 64.4 mph (103.63 km/h) |
| 70 mph (112.65 km/h) | 69.35 mph (111.61 km/h) |
| 75 mph (120.7 km/h) | 74.3 mph (119.58 km/h) |
| 80 mph (128.75 km/h) | 79.26 mph (127.55 km/h) |
| 85 mph (136.79 km/h) | 84.21 mph (135.52 km/h) |
| 90 mph (144.84 km/h) | 89.16 mph (143.49 km/h) |
| 95 mph (152.89 km/h) | 94.12 mph (151.47 km/h) |
| 100 mph (160.93 km/h) | 99.07 mph (159.44 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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