Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/25-20 | 285/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.5) | 26.73 (679) | -0.06 (-1.5) -0.2% |
| Width inches (mm) | 13.58 (345) | 11.22 (285) | -2.36 (-60) -17.4% |
| Circum. inches (mm) | 84.17 (2137.85) | 83.98 (2133.14) | -0.19 (-4.71) -0.2% |
| Sidewall Height inches (mm) | 3.4 (86.25) | 3.37 (85.5) | -0.03 (-0.75) -0.9% |
| Revolutions per mile (km) | 752.78 (467.76) | 754.45 (468.79) | 1.66 (1.03) 0.2% |
285/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.96 mph (32.12 km/h) |
| 25 mph (40.23 km/h) | 24.94 mph (40.14 km/h) |
| 30 mph (48.28 km/h) | 29.93 mph (48.17 km/h) |
| 35 mph (56.33 km/h) | 34.92 mph (56.2 km/h) |
| 40 mph (64.37 km/h) | 39.91 mph (64.23 km/h) |
| 45 mph (72.42 km/h) | 44.9 mph (72.26 km/h) |
| 50 mph (80.47 km/h) | 49.89 mph (80.29 km/h) |
| 55 mph (88.51 km/h) | 54.88 mph (88.32 km/h) |
| 60 mph (96.56 km/h) | 59.87 mph (96.35 km/h) |
| 65 mph (104.61 km/h) | 64.86 mph (104.38 km/h) |
| 70 mph (112.65 km/h) | 69.85 mph (112.41 km/h) |
| 75 mph (120.7 km/h) | 74.83 mph (120.43 km/h) |
| 80 mph (128.75 km/h) | 79.82 mph (128.46 km/h) |
| 85 mph (136.79 km/h) | 84.81 mph (136.49 km/h) |
| 90 mph (144.84 km/h) | 89.8 mph (144.52 km/h) |
| 95 mph (152.89 km/h) | 94.79 mph (152.55 km/h) |
| 100 mph (160.93 km/h) | 99.78 mph (160.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1920 | 2230 | 2402 | 2508 | 2623 | 2704 | 2794 | 2900 | 3047 | 3194 | 3358 | 3489 | 3725 | 3987 | 4191 | 4322 | 4395 | 4665 | 5041 | 5858 |
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