Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/65-18 | 285/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.21 (691.2) | 32.59 (827.7) | 5.37 (136.5) 19.7% |
| Width inches (mm) | 7.09 (180) | 11.22 (285) | 4.13 (105) 58.3% |
| Circum. inches (mm) | 85.49 (2171.47) | 102.37 (2600.3) | 16.88 (428.83) 19.7% |
| Sidewall Height inches (mm) | 4.61 (117) | 7.29 (185.25) | 2.69 (68.25) 58.3% |
| Revolutions per mile (km) | 741.13 (460.52) | 618.91 (384.57) | -122.22 (-75.95) -16.5% |
285/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.95 mph (38.54 km/h) |
| 25 mph (40.23 km/h) | 29.94 mph (48.18 km/h) |
| 30 mph (48.28 km/h) | 35.92 mph (57.81 km/h) |
| 35 mph (56.33 km/h) | 41.91 mph (67.45 km/h) |
| 40 mph (64.37 km/h) | 47.9 mph (77.09 km/h) |
| 45 mph (72.42 km/h) | 53.89 mph (86.72 km/h) |
| 50 mph (80.47 km/h) | 59.87 mph (96.36 km/h) |
| 55 mph (88.51 km/h) | 65.86 mph (105.99 km/h) |
| 60 mph (96.56 km/h) | 71.85 mph (115.63 km/h) |
| 65 mph (104.61 km/h) | 77.84 mph (125.27 km/h) |
| 70 mph (112.65 km/h) | 83.82 mph (134.9 km/h) |
| 75 mph (120.7 km/h) | 89.81 mph (144.54 km/h) |
| 80 mph (128.75 km/h) | 95.8 mph (154.17 km/h) |
| 85 mph (136.79 km/h) | 101.79 mph (163.81 km/h) |
| 90 mph (144.84 km/h) | 107.77 mph (173.44 km/h) |
| 95 mph (152.89 km/h) | 113.76 mph (183.08 km/h) |
| 100 mph (160.93 km/h) | 119.75 mph (192.72 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1575 | 1830 | 1970 | 2058 | 2151 | 2218 | 2292 | 2379 | 2500 | 2621 | 2755 | 2862 | 3056 | 3271 | 3438 | 3545 | 3606 | 3827 | 4135 | 4805 |
Better Fuel Economy Factory Ratios Increased Power
