Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-20 | 285/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.5) | 28.98 (736) | 0.3 (7.5) 1% |
| Width inches (mm) | 9.65 (245) | 11.22 (285) | 1.57 (40) 16.3% |
| Circum. inches (mm) | 90.1 (2288.65) | 91.03 (2312.21) | 0.93 (23.56) 1% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 4.49 (114) | 0.15 (3.75) 3.4% |
| Revolutions per mile (km) | 703.18 (436.94) | 696.02 (432.49) | -7.17 (-4.45) -1% |
285/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.21 mph (32.52 km/h) |
| 25 mph (40.23 km/h) | 25.26 mph (40.65 km/h) |
| 30 mph (48.28 km/h) | 30.31 mph (48.78 km/h) |
| 35 mph (56.33 km/h) | 35.36 mph (56.91 km/h) |
| 40 mph (64.37 km/h) | 40.41 mph (65.04 km/h) |
| 45 mph (72.42 km/h) | 45.46 mph (73.17 km/h) |
| 50 mph (80.47 km/h) | 50.51 mph (81.3 km/h) |
| 55 mph (88.51 km/h) | 55.57 mph (89.43 km/h) |
| 60 mph (96.56 km/h) | 60.62 mph (97.55 km/h) |
| 65 mph (104.61 km/h) | 65.67 mph (105.68 km/h) |
| 70 mph (112.65 km/h) | 70.72 mph (113.81 km/h) |
| 75 mph (120.7 km/h) | 75.77 mph (121.94 km/h) |
| 80 mph (128.75 km/h) | 80.82 mph (130.07 km/h) |
| 85 mph (136.79 km/h) | 85.88 mph (138.2 km/h) |
| 90 mph (144.84 km/h) | 90.93 mph (146.33 km/h) |
| 95 mph (152.89 km/h) | 95.98 mph (154.46 km/h) |
| 100 mph (160.93 km/h) | 101.03 mph (162.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1771 | 2058 | 2216 | 2314 | 2419 | 2495 | 2578 | 2676 | 2811 | 2947 | 3098 | 3218 | 3437 | 3678 | 3867 | 3987 | 4055 | 4304 | 4650 | 5404 |
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