Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/35-20 | 285/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.85 (707.5) | 28.98 (736) | 1.12 (28.5) 4% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 87.51 (2222.68) | 91.03 (2312.21) | 3.53 (89.54) 4% |
| Sidewall Height inches (mm) | 3.93 (99.75) | 4.49 (114) | 0.56 (14.25) 14.3% |
| Revolutions per mile (km) | 724.06 (449.91) | 696.02 (432.49) | -28.04 (-17.42) -3.9% |
285/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.81 mph (33.48 km/h) |
| 25 mph (40.23 km/h) | 26.01 mph (41.85 km/h) |
| 30 mph (48.28 km/h) | 31.21 mph (50.23 km/h) |
| 35 mph (56.33 km/h) | 36.41 mph (58.6 km/h) |
| 40 mph (64.37 km/h) | 41.61 mph (66.97 km/h) |
| 45 mph (72.42 km/h) | 46.81 mph (75.34 km/h) |
| 50 mph (80.47 km/h) | 52.01 mph (83.71 km/h) |
| 55 mph (88.51 km/h) | 57.22 mph (92.08 km/h) |
| 60 mph (96.56 km/h) | 62.42 mph (100.45 km/h) |
| 65 mph (104.61 km/h) | 67.62 mph (108.82 km/h) |
| 70 mph (112.65 km/h) | 72.82 mph (117.19 km/h) |
| 75 mph (120.7 km/h) | 78.02 mph (125.56 km/h) |
| 80 mph (128.75 km/h) | 83.22 mph (133.93 km/h) |
| 85 mph (136.79 km/h) | 88.42 mph (142.3 km/h) |
| 90 mph (144.84 km/h) | 93.63 mph (150.68 km/h) |
| 95 mph (152.89 km/h) | 98.83 mph (159.05 km/h) |
| 100 mph (160.93 km/h) | 104.03 mph (167.42 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
