Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 330/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.39 (721.2) | 0.16 (4) 0.6% |
| Width inches (mm) | 12.8 (325) | 12.99 (330) | 0.2 (5) 1.5% |
| Circum. inches (mm) | 88.71 (2253.15) | 89.2 (2265.72) | 0.49 (12.57) 0.6% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.2 (132) | 0.08 (2) 1.5% |
| Revolutions per mile (km) | 714.26 (443.82) | 710.3 (441.36) | -3.96 (-2.46) -0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.11 mph (32.37 km/h) |
| 25 mph (40.23 km/h) | 25.14 mph (40.46 km/h) |
| 30 mph (48.28 km/h) | 30.17 mph (48.55 km/h) |
| 35 mph (56.33 km/h) | 35.2 mph (56.64 km/h) |
| 40 mph (64.37 km/h) | 40.22 mph (64.73 km/h) |
| 45 mph (72.42 km/h) | 45.25 mph (72.82 km/h) |
| 50 mph (80.47 km/h) | 50.28 mph (80.92 km/h) |
| 55 mph (88.51 km/h) | 55.31 mph (89.01 km/h) |
| 60 mph (96.56 km/h) | 60.33 mph (97.1 km/h) |
| 65 mph (104.61 km/h) | 65.36 mph (105.19 km/h) |
| 70 mph (112.65 km/h) | 70.39 mph (113.28 km/h) |
| 75 mph (120.7 km/h) | 75.42 mph (121.37 km/h) |
| 80 mph (128.75 km/h) | 80.45 mph (129.47 km/h) |
| 85 mph (136.79 km/h) | 85.47 mph (137.56 km/h) |
| 90 mph (144.84 km/h) | 90.5 mph (145.65 km/h) |
| 95 mph (152.89 km/h) | 95.53 mph (153.74 km/h) |
| 100 mph (160.93 km/h) | 100.56 mph (161.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1808 | 2100 | 2261 | 2361 | 2469 | 2546 | 2631 | 2731 | 2869 | 3008 | 3161 | 3284 | 3507 | 3754 | 3946 | 4069 | 4138 | 4392 | 4746 | 5515 |
Better Fuel Economy Factory Ratios Increased Power
