Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 315/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 27.92 (709.2) | -0.31 (-8) -1.1% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 88.71 (2253.15) | 87.72 (2228.02) | -0.99 (-25.13) -1.1% |
| Sidewall Height inches (mm) | 5.12 (130) | 4.96 (126) | -0.16 (-4) -3.1% |
| Revolutions per mile (km) | 714.26 (443.82) | 722.32 (448.83) | 8.06 (5.01) 1.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.78 mph (31.83 km/h) |
| 25 mph (40.23 km/h) | 24.72 mph (39.78 km/h) |
| 30 mph (48.28 km/h) | 29.67 mph (47.74 km/h) |
| 35 mph (56.33 km/h) | 34.61 mph (55.7 km/h) |
| 40 mph (64.37 km/h) | 39.55 mph (63.66 km/h) |
| 45 mph (72.42 km/h) | 44.5 mph (71.61 km/h) |
| 50 mph (80.47 km/h) | 49.44 mph (79.57 km/h) |
| 55 mph (88.51 km/h) | 54.39 mph (87.53 km/h) |
| 60 mph (96.56 km/h) | 59.33 mph (95.48 km/h) |
| 65 mph (104.61 km/h) | 64.27 mph (103.44 km/h) |
| 70 mph (112.65 km/h) | 69.22 mph (111.4 km/h) |
| 75 mph (120.7 km/h) | 74.16 mph (119.35 km/h) |
| 80 mph (128.75 km/h) | 79.11 mph (127.31 km/h) |
| 85 mph (136.79 km/h) | 84.05 mph (135.27 km/h) |
| 90 mph (144.84 km/h) | 89 mph (143.23 km/h) |
| 95 mph (152.89 km/h) | 93.94 mph (151.18 km/h) |
| 100 mph (160.93 km/h) | 98.88 mph (159.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1838 | 2135 | 2300 | 2401 | 2511 | 2589 | 2675 | 2777 | 2918 | 3058 | 3215 | 3340 | 3567 | 3817 | 4013 | 4138 | 4208 | 4466 | 4826 | 5608 |
Better Fuel Economy Factory Ratios Increased Power
