Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/65-18 | 285/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.61 (853.7) | 32.59 (827.7) | -1.02 (-26) -3% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 105.59 (2681.98) | 102.37 (2600.3) | -3.22 (-81.68) -3% |
| Sidewall Height inches (mm) | 7.81 (198.25) | 7.29 (185.25) | -0.51 (-13) -6.6% |
| Revolutions per mile (km) | 600.06 (372.86) | 618.91 (384.57) | 18.85 (11.71) 3.1% |
285/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.39 mph (31.21 km/h) |
| 25 mph (40.23 km/h) | 24.24 mph (39.01 km/h) |
| 30 mph (48.28 km/h) | 29.09 mph (46.81 km/h) |
| 35 mph (56.33 km/h) | 33.93 mph (54.61 km/h) |
| 40 mph (64.37 km/h) | 38.78 mph (62.41 km/h) |
| 45 mph (72.42 km/h) | 43.63 mph (70.22 km/h) |
| 50 mph (80.47 km/h) | 48.48 mph (78.02 km/h) |
| 55 mph (88.51 km/h) | 53.32 mph (85.82 km/h) |
| 60 mph (96.56 km/h) | 58.17 mph (93.62 km/h) |
| 65 mph (104.61 km/h) | 63.02 mph (101.42 km/h) |
| 70 mph (112.65 km/h) | 67.87 mph (109.22 km/h) |
| 75 mph (120.7 km/h) | 72.72 mph (117.03 km/h) |
| 80 mph (128.75 km/h) | 77.56 mph (124.83 km/h) |
| 85 mph (136.79 km/h) | 82.41 mph (132.63 km/h) |
| 90 mph (144.84 km/h) | 87.26 mph (140.43 km/h) |
| 95 mph (152.89 km/h) | 92.11 mph (148.23 km/h) |
| 100 mph (160.93 km/h) | 96.95 mph (156.03 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
