Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 285/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 31.46 (799.2) | 3.23 (82) 11.4% |
| Width inches (mm) | 12.8 (325) | 11.22 (285) | -1.57 (-40) -12.3% |
| Circum. inches (mm) | 88.71 (2253.15) | 98.85 (2510.76) | 10.14 (257.61) 11.4% |
| Sidewall Height inches (mm) | 5.12 (130) | 6.73 (171) | 1.61 (41) 31.5% |
| Revolutions per mile (km) | 714.26 (443.82) | 640.98 (398.28) | -73.29 (-45.54) -10.3% |
285/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.29 mph (35.87 km/h) |
| 25 mph (40.23 km/h) | 27.86 mph (44.83 km/h) |
| 30 mph (48.28 km/h) | 33.43 mph (53.8 km/h) |
| 35 mph (56.33 km/h) | 39 mph (62.77 km/h) |
| 40 mph (64.37 km/h) | 44.57 mph (71.73 km/h) |
| 45 mph (72.42 km/h) | 50.15 mph (80.7 km/h) |
| 50 mph (80.47 km/h) | 55.72 mph (89.67 km/h) |
| 55 mph (88.51 km/h) | 61.29 mph (98.63 km/h) |
| 60 mph (96.56 km/h) | 66.86 mph (107.6 km/h) |
| 65 mph (104.61 km/h) | 72.43 mph (116.57 km/h) |
| 70 mph (112.65 km/h) | 78 mph (125.53 km/h) |
| 75 mph (120.7 km/h) | 83.58 mph (134.5 km/h) |
| 80 mph (128.75 km/h) | 89.15 mph (143.47 km/h) |
| 85 mph (136.79 km/h) | 94.72 mph (152.43 km/h) |
| 90 mph (144.84 km/h) | 100.29 mph (161.4 km/h) |
| 95 mph (152.89 km/h) | 105.86 mph (170.37 km/h) |
| 100 mph (160.93 km/h) | 111.43 mph (179.33 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1631 | 1895 | 2041 | 2131 | 2228 | 2298 | 2374 | 2464 | 2589 | 2714 | 2853 | 2964 | 3165 | 3387 | 3561 | 3672 | 3734 | 3963 | 4283 | 4977 |
Better Fuel Economy Factory Ratios Increased Power
