Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-18 | 315/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.81 (731.7) | 27.92 (709.2) | -0.89 (-22.5) -3.1% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 90.5 (2298.7) | 87.72 (2228.02) | -2.78 (-70.69) -3.1% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 4.96 (126) | -0.44 (-11.25) -8.2% |
| Revolutions per mile (km) | 700.11 (435.03) | 722.32 (448.83) | 22.21 (13.8) 3.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.38 mph (31.2 km/h) |
| 25 mph (40.23 km/h) | 24.23 mph (39 km/h) |
| 30 mph (48.28 km/h) | 29.08 mph (46.8 km/h) |
| 35 mph (56.33 km/h) | 33.92 mph (54.6 km/h) |
| 40 mph (64.37 km/h) | 38.77 mph (62.39 km/h) |
| 45 mph (72.42 km/h) | 43.62 mph (70.19 km/h) |
| 50 mph (80.47 km/h) | 48.46 mph (77.99 km/h) |
| 55 mph (88.51 km/h) | 53.31 mph (85.79 km/h) |
| 60 mph (96.56 km/h) | 58.15 mph (93.59 km/h) |
| 65 mph (104.61 km/h) | 63 mph (101.39 km/h) |
| 70 mph (112.65 km/h) | 67.85 mph (109.19 km/h) |
| 75 mph (120.7 km/h) | 72.69 mph (116.99 km/h) |
| 80 mph (128.75 km/h) | 77.54 mph (124.79 km/h) |
| 85 mph (136.79 km/h) | 82.39 mph (132.59 km/h) |
| 90 mph (144.84 km/h) | 87.23 mph (140.39 km/h) |
| 95 mph (152.89 km/h) | 92.08 mph (148.19 km/h) |
| 100 mph (160.93 km/h) | 96.92 mph (155.99 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
