Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-19 | 285/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.2 (640.1) | 32.59 (827.7) | 7.39 (187.6) 29.3% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 79.17 (2010.93) | 102.37 (2600.3) | 23.2 (589.36) 29.3% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 7.29 (185.25) | 4.19 (106.5) 135.2% |
| Revolutions per mile (km) | 800.3 (497.28) | 618.91 (384.57) | -181.39 (-112.71) -22.7% |
285/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.86 mph (41.62 km/h) |
| 25 mph (40.23 km/h) | 32.33 mph (52.03 km/h) |
| 30 mph (48.28 km/h) | 38.79 mph (62.43 km/h) |
| 35 mph (56.33 km/h) | 45.26 mph (72.84 km/h) |
| 40 mph (64.37 km/h) | 51.72 mph (83.24 km/h) |
| 45 mph (72.42 km/h) | 58.19 mph (93.65 km/h) |
| 50 mph (80.47 km/h) | 64.65 mph (104.05 km/h) |
| 55 mph (88.51 km/h) | 71.12 mph (114.46 km/h) |
| 60 mph (96.56 km/h) | 77.58 mph (124.86 km/h) |
| 65 mph (104.61 km/h) | 84.05 mph (135.27 km/h) |
| 70 mph (112.65 km/h) | 90.52 mph (145.67 km/h) |
| 75 mph (120.7 km/h) | 96.98 mph (156.08 km/h) |
| 80 mph (128.75 km/h) | 103.45 mph (166.48 km/h) |
| 85 mph (136.79 km/h) | 109.91 mph (176.89 km/h) |
| 90 mph (144.84 km/h) | 116.38 mph (187.29 km/h) |
| 95 mph (152.89 km/h) | 122.84 mph (197.7 km/h) |
| 100 mph (160.93 km/h) | 129.31 mph (208.1 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
