Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/45-17 | 285/40-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.52 (724.3) | 25.98 (659.8) | -2.54 (-64.5) -8.9% |
| Width inches (mm) | 12.8 (325) | 11.22 (285) | -1.57 (-40) -12.3% |
| Circum. inches (mm) | 89.58 (2275.46) | 81.61 (2072.82) | -7.98 (-202.63) -8.9% |
| Sidewall Height inches (mm) | 5.76 (146.25) | 4.49 (114) | -1.27 (-32.25) -22.1% |
| Revolutions per mile (km) | 707.26 (439.47) | 776.4 (482.43) | 69.14 (42.96) 9.8% |
285/40-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.22 mph (29.32 km/h) |
| 25 mph (40.23 km/h) | 22.77 mph (36.65 km/h) |
| 30 mph (48.28 km/h) | 27.33 mph (43.98 km/h) |
| 35 mph (56.33 km/h) | 31.88 mph (51.31 km/h) |
| 40 mph (64.37 km/h) | 36.44 mph (58.64 km/h) |
| 45 mph (72.42 km/h) | 40.99 mph (65.97 km/h) |
| 50 mph (80.47 km/h) | 45.55 mph (73.3 km/h) |
| 55 mph (88.51 km/h) | 50.1 mph (80.63 km/h) |
| 60 mph (96.56 km/h) | 54.66 mph (87.96 km/h) |
| 65 mph (104.61 km/h) | 59.21 mph (95.29 km/h) |
| 70 mph (112.65 km/h) | 63.77 mph (102.62 km/h) |
| 75 mph (120.7 km/h) | 68.32 mph (109.95 km/h) |
| 80 mph (128.75 km/h) | 72.88 mph (117.28 km/h) |
| 85 mph (136.79 km/h) | 77.43 mph (124.61 km/h) |
| 90 mph (144.84 km/h) | 81.99 mph (131.94 km/h) |
| 95 mph (152.89 km/h) | 86.54 mph (139.27 km/h) |
| 100 mph (160.93 km/h) | 91.09 mph (146.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1976 | 2295 | 2472 | 2581 | 2699 | 2783 | 2875 | 2985 | 3136 | 3287 | 3456 | 3590 | 3834 | 4103 | 4313 | 4448 | 4523 | 4801 | 5188 | 6028 |
Better Fuel Economy Factory Ratios Increased Power
