Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/70-18 | 285/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.36 (898.2) | 33.71 (856.2) | -1.65 (-42) -4.7% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 111.09 (2821.78) | 105.9 (2689.83) | -5.19 (-131.95) -4.7% |
| Sidewall Height inches (mm) | 8.68 (220.5) | 7.85 (199.5) | -0.83 (-21) -9.5% |
| Revolutions per mile (km) | 570.33 (354.39) | 598.31 (371.77) | 27.98 (17.38) 4.9% |
285/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.06 mph (30.68 km/h) |
| 25 mph (40.23 km/h) | 23.83 mph (38.35 km/h) |
| 30 mph (48.28 km/h) | 28.6 mph (46.02 km/h) |
| 35 mph (56.33 km/h) | 33.36 mph (53.69 km/h) |
| 40 mph (64.37 km/h) | 38.13 mph (61.36 km/h) |
| 45 mph (72.42 km/h) | 42.9 mph (69.03 km/h) |
| 50 mph (80.47 km/h) | 47.66 mph (76.7 km/h) |
| 55 mph (88.51 km/h) | 52.43 mph (84.38 km/h) |
| 60 mph (96.56 km/h) | 57.19 mph (92.05 km/h) |
| 65 mph (104.61 km/h) | 61.96 mph (99.72 km/h) |
| 70 mph (112.65 km/h) | 66.73 mph (107.39 km/h) |
| 75 mph (120.7 km/h) | 71.49 mph (115.06 km/h) |
| 80 mph (128.75 km/h) | 76.26 mph (122.73 km/h) |
| 85 mph (136.79 km/h) | 81.03 mph (130.4 km/h) |
| 90 mph (144.84 km/h) | 85.79 mph (138.07 km/h) |
| 95 mph (152.89 km/h) | 90.56 mph (145.74 km/h) |
| 100 mph (160.93 km/h) | 95.32 mph (153.41 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1523 | 1769 | 1905 | 1989 | 2080 | 2145 | 2216 | 2300 | 2417 | 2533 | 2663 | 2767 | 2954 | 3162 | 3324 | 3427 | 3486 | 3700 | 3998 | 4645 |
Better Fuel Economy Factory Ratios Increased Power
