Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-19 | 285/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.2 (640.1) | 24.73 (628.2) | -0.47 (-11.9) -1.9% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 79.17 (2010.93) | 77.7 (1973.55) | -1.47 (-37.38) -1.9% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 3.37 (85.5) | 0.27 (6.75) 8.6% |
| Revolutions per mile (km) | 800.3 (497.28) | 815.46 (506.7) | 15.16 (9.42) 1.9% |
285/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.63 mph (31.59 km/h) |
| 25 mph (40.23 km/h) | 24.54 mph (39.49 km/h) |
| 30 mph (48.28 km/h) | 29.44 mph (47.38 km/h) |
| 35 mph (56.33 km/h) | 34.35 mph (55.28 km/h) |
| 40 mph (64.37 km/h) | 39.26 mph (63.18 km/h) |
| 45 mph (72.42 km/h) | 44.16 mph (71.07 km/h) |
| 50 mph (80.47 km/h) | 49.07 mph (78.97 km/h) |
| 55 mph (88.51 km/h) | 53.98 mph (86.87 km/h) |
| 60 mph (96.56 km/h) | 58.88 mph (94.77 km/h) |
| 65 mph (104.61 km/h) | 63.79 mph (102.66 km/h) |
| 70 mph (112.65 km/h) | 68.7 mph (110.56 km/h) |
| 75 mph (120.7 km/h) | 73.61 mph (118.46 km/h) |
| 80 mph (128.75 km/h) | 78.51 mph (126.35 km/h) |
| 85 mph (136.79 km/h) | 83.42 mph (134.25 km/h) |
| 90 mph (144.84 km/h) | 88.33 mph (142.15 km/h) |
| 95 mph (152.89 km/h) | 93.23 mph (150.05 km/h) |
| 100 mph (160.93 km/h) | 98.14 mph (157.94 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2075 | 2411 | 2596 | 2711 | 2835 | 2923 | 3020 | 3135 | 3294 | 3453 | 3629 | 3771 | 4027 | 4309 | 4530 | 4671 | 4751 | 5042 | 5448 | 6332 |
Better Fuel Economy Factory Ratios Increased Power
