Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-17 | 305/40-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.98 (659.8) | 26.61 (675.8) | 0.63 (16) 2.4% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 81.61 (2072.82) | 83.59 (2123.09) | 1.98 (50.27) 2.4% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.8 (122) | 0.31 (8) 7% |
| Revolutions per mile (km) | 776.4 (482.43) | 758.02 (471.01) | -18.38 (-11.42) -2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.48 mph (32.97 km/h) |
| 25 mph (40.23 km/h) | 25.61 mph (41.21 km/h) |
| 30 mph (48.28 km/h) | 30.73 mph (49.45 km/h) |
| 35 mph (56.33 km/h) | 35.85 mph (57.69 km/h) |
| 40 mph (64.37 km/h) | 40.97 mph (65.93 km/h) |
| 45 mph (72.42 km/h) | 46.09 mph (74.18 km/h) |
| 50 mph (80.47 km/h) | 51.21 mph (82.42 km/h) |
| 55 mph (88.51 km/h) | 56.33 mph (90.66 km/h) |
| 60 mph (96.56 km/h) | 61.45 mph (98.9 km/h) |
| 65 mph (104.61 km/h) | 66.58 mph (107.14 km/h) |
| 70 mph (112.65 km/h) | 71.7 mph (115.39 km/h) |
| 75 mph (120.7 km/h) | 76.82 mph (123.63 km/h) |
| 80 mph (128.75 km/h) | 81.94 mph (131.87 km/h) |
| 85 mph (136.79 km/h) | 87.06 mph (140.11 km/h) |
| 90 mph (144.84 km/h) | 92.18 mph (148.35 km/h) |
| 95 mph (152.89 km/h) | 97.3 mph (156.6 km/h) |
| 100 mph (160.93 km/h) | 102.42 mph (164.84 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1929 | 2241 | 2413 | 2520 | 2635 | 2717 | 2807 | 2914 | 3062 | 3210 | 3374 | 3505 | 3743 | 4006 | 4211 | 4342 | 4416 | 4687 | 5065 | 5886 |
Better Fuel Economy Factory Ratios Increased Power
