Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 285/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 32.71 (830.8) | -7.32 (-186) -18.3% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 125.76 (3194.37) | 102.76 (2610.04) | -23.01 (-584.34) -18.3% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 7.85 (199.5) | -2.16 (-54.9) -21.6% |
| Revolutions per mile (km) | 503.81 (313.05) | 616.6 (383.14) | 112.79 (70.09) 22.4% |
285/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.34 mph (26.3 km/h) |
| 25 mph (40.23 km/h) | 20.43 mph (32.87 km/h) |
| 30 mph (48.28 km/h) | 24.51 mph (39.45 km/h) |
| 35 mph (56.33 km/h) | 28.6 mph (46.02 km/h) |
| 40 mph (64.37 km/h) | 32.68 mph (52.6 km/h) |
| 45 mph (72.42 km/h) | 36.77 mph (59.17 km/h) |
| 50 mph (80.47 km/h) | 40.85 mph (65.75 km/h) |
| 55 mph (88.51 km/h) | 44.94 mph (72.32 km/h) |
| 60 mph (96.56 km/h) | 49.02 mph (78.9 km/h) |
| 65 mph (104.61 km/h) | 53.11 mph (85.47 km/h) |
| 70 mph (112.65 km/h) | 57.2 mph (92.05 km/h) |
| 75 mph (120.7 km/h) | 61.28 mph (98.62 km/h) |
| 80 mph (128.75 km/h) | 65.37 mph (105.2 km/h) |
| 85 mph (136.79 km/h) | 69.45 mph (111.77 km/h) |
| 90 mph (144.84 km/h) | 73.54 mph (118.35 km/h) |
| 95 mph (152.89 km/h) | 77.62 mph (124.92 km/h) |
| 100 mph (160.93 km/h) | 81.71 mph (131.5 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1569 | 1823 | 1963 | 2050 | 2143 | 2210 | 2284 | 2370 | 2491 | 2611 | 2744 | 2851 | 3045 | 3258 | 3425 | 3532 | 3592 | 3813 | 4120 | 4788 |
Better Fuel Economy Factory Ratios Increased Power
