Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 305/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.81 (731.7) | 0.57 (14.5) 2% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 88.71 (2253.15) | 90.5 (2298.7) | 1.79 (45.55) 2% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.4 (137.25) | 0.29 (7.25) 5.6% |
| Revolutions per mile (km) | 714.26 (443.82) | 700.11 (435.03) | -14.15 (-8.8) -2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.4 mph (32.84 km/h) |
| 25 mph (40.23 km/h) | 25.51 mph (41.05 km/h) |
| 30 mph (48.28 km/h) | 30.61 mph (49.26 km/h) |
| 35 mph (56.33 km/h) | 35.71 mph (57.47 km/h) |
| 40 mph (64.37 km/h) | 40.81 mph (65.68 km/h) |
| 45 mph (72.42 km/h) | 45.91 mph (73.88 km/h) |
| 50 mph (80.47 km/h) | 51.01 mph (82.09 km/h) |
| 55 mph (88.51 km/h) | 56.11 mph (90.3 km/h) |
| 60 mph (96.56 km/h) | 61.21 mph (98.51 km/h) |
| 65 mph (104.61 km/h) | 66.31 mph (106.72 km/h) |
| 70 mph (112.65 km/h) | 71.42 mph (114.93 km/h) |
| 75 mph (120.7 km/h) | 76.52 mph (123.14 km/h) |
| 80 mph (128.75 km/h) | 81.62 mph (131.35 km/h) |
| 85 mph (136.79 km/h) | 86.72 mph (139.56 km/h) |
| 90 mph (144.84 km/h) | 91.82 mph (147.77 km/h) |
| 95 mph (152.89 km/h) | 96.92 mph (155.98 km/h) |
| 100 mph (160.93 km/h) | 102.02 mph (164.19 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1782 | 2070 | 2229 | 2328 | 2434 | 2509 | 2593 | 2691 | 2828 | 2964 | 3116 | 3237 | 3457 | 3700 | 3889 | 4011 | 4079 | 4329 | 4678 | 5436 |
Better Fuel Economy Factory Ratios Increased Power
