Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-20 | 285/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.81 (935) | 32.71 (830.8) | -4.1 (-104.2) -11.1% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 115.65 (2937.39) | 102.76 (2610.04) | -12.89 (-327.35) -11.1% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 7.85 (199.5) | -0.55 (-14) -6.6% |
| Revolutions per mile (km) | 547.88 (340.44) | 616.6 (383.14) | 68.72 (42.7) 12.5% |
285/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.77 mph (28.6 km/h) |
| 25 mph (40.23 km/h) | 22.21 mph (35.75 km/h) |
| 30 mph (48.28 km/h) | 26.66 mph (42.9 km/h) |
| 35 mph (56.33 km/h) | 31.1 mph (50.05 km/h) |
| 40 mph (64.37 km/h) | 35.54 mph (57.2 km/h) |
| 45 mph (72.42 km/h) | 39.99 mph (64.35 km/h) |
| 50 mph (80.47 km/h) | 44.43 mph (71.5 km/h) |
| 55 mph (88.51 km/h) | 48.87 mph (78.65 km/h) |
| 60 mph (96.56 km/h) | 53.31 mph (85.8 km/h) |
| 65 mph (104.61 km/h) | 57.76 mph (92.95 km/h) |
| 70 mph (112.65 km/h) | 62.2 mph (100.1 km/h) |
| 75 mph (120.7 km/h) | 66.64 mph (107.25 km/h) |
| 80 mph (128.75 km/h) | 71.08 mph (114.4 km/h) |
| 85 mph (136.79 km/h) | 75.53 mph (121.55 km/h) |
| 90 mph (144.84 km/h) | 79.97 mph (128.7 km/h) |
| 95 mph (152.89 km/h) | 84.41 mph (135.85 km/h) |
| 100 mph (160.93 km/h) | 88.86 mph (143 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
