Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/40-20 | 285/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.35 (720) | 28.98 (736) | 0.63 (16) 2.2% |
| Width inches (mm) | 10.43 (265) | 11.22 (285) | 0.79 (20) 7.5% |
| Circum. inches (mm) | 89.05 (2261.95) | 91.03 (2312.21) | 1.98 (50.27) 2.2% |
| Sidewall Height inches (mm) | 4.17 (106) | 4.49 (114) | 0.31 (8) 7.5% |
| Revolutions per mile (km) | 711.49 (442.1) | 696.02 (432.49) | -15.47 (-9.61) -2.2% |
285/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.44 mph (32.9 km/h) |
| 25 mph (40.23 km/h) | 25.56 mph (41.13 km/h) |
| 30 mph (48.28 km/h) | 30.67 mph (49.35 km/h) |
| 35 mph (56.33 km/h) | 35.78 mph (57.58 km/h) |
| 40 mph (64.37 km/h) | 40.89 mph (65.8 km/h) |
| 45 mph (72.42 km/h) | 46 mph (74.03 km/h) |
| 50 mph (80.47 km/h) | 51.11 mph (82.26 km/h) |
| 55 mph (88.51 km/h) | 56.22 mph (90.48 km/h) |
| 60 mph (96.56 km/h) | 61.33 mph (98.71 km/h) |
| 65 mph (104.61 km/h) | 66.44 mph (106.93 km/h) |
| 70 mph (112.65 km/h) | 71.56 mph (115.16 km/h) |
| 75 mph (120.7 km/h) | 76.67 mph (123.38 km/h) |
| 80 mph (128.75 km/h) | 81.78 mph (131.61 km/h) |
| 85 mph (136.79 km/h) | 86.89 mph (139.83 km/h) |
| 90 mph (144.84 km/h) | 92 mph (148.06 km/h) |
| 95 mph (152.89 km/h) | 97.11 mph (156.29 km/h) |
| 100 mph (160.93 km/h) | 102.22 mph (164.51 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 |
Better Fuel Economy Factory Ratios Increased Power
