Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 325/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 30.8 (782.2) | 2.56 (65) 9.1% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 88.71 (2253.15) | 96.75 (2457.35) | 8.04 (204.2) 9.1% |
| Sidewall Height inches (mm) | 5.12 (130) | 6.4 (162.5) | 1.28 (32.5) 25% |
| Revolutions per mile (km) | 714.26 (443.82) | 654.91 (406.94) | -59.35 (-36.88) -8.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.81 mph (35.1 km/h) |
| 25 mph (40.23 km/h) | 27.27 mph (43.88 km/h) |
| 30 mph (48.28 km/h) | 32.72 mph (52.66 km/h) |
| 35 mph (56.33 km/h) | 38.17 mph (61.43 km/h) |
| 40 mph (64.37 km/h) | 43.63 mph (70.21 km/h) |
| 45 mph (72.42 km/h) | 49.08 mph (78.98 km/h) |
| 50 mph (80.47 km/h) | 54.53 mph (87.76 km/h) |
| 55 mph (88.51 km/h) | 59.98 mph (96.54 km/h) |
| 60 mph (96.56 km/h) | 65.44 mph (105.31 km/h) |
| 65 mph (104.61 km/h) | 70.89 mph (114.09 km/h) |
| 70 mph (112.65 km/h) | 76.34 mph (122.86 km/h) |
| 75 mph (120.7 km/h) | 81.8 mph (131.64 km/h) |
| 80 mph (128.75 km/h) | 87.25 mph (140.42 km/h) |
| 85 mph (136.79 km/h) | 92.7 mph (149.19 km/h) |
| 90 mph (144.84 km/h) | 98.16 mph (157.97 km/h) |
| 95 mph (152.89 km/h) | 103.61 mph (166.74 km/h) |
| 100 mph (160.93 km/h) | 109.06 mph (175.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1667 | 1936 | 2085 | 2177 | 2277 | 2347 | 2425 | 2518 | 2645 | 2773 | 2915 | 3028 | 3234 | 3461 | 3638 | 3752 | 3815 | 4050 | 4376 | 5085 |
Better Fuel Economy Factory Ratios Increased Power
