Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 325/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 38.47 (977.2) | 3 (76.2) 8.5% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 111.44 (2830.57) | 120.86 (3069.96) | 9.42 (239.39) 8.5% |
| Sidewall Height inches (mm) | 10.24 (260) | 10.24 (260) | 0 (0) 0% |
| Revolutions per mile (km) | 568.56 (353.28) | 524.22 (325.74) | -44.33 (-27.55) -7.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.69 mph (34.91 km/h) |
| 25 mph (40.23 km/h) | 27.11 mph (43.64 km/h) |
| 30 mph (48.28 km/h) | 32.54 mph (52.36 km/h) |
| 35 mph (56.33 km/h) | 37.96 mph (61.09 km/h) |
| 40 mph (64.37 km/h) | 43.38 mph (69.82 km/h) |
| 45 mph (72.42 km/h) | 48.81 mph (78.55 km/h) |
| 50 mph (80.47 km/h) | 54.23 mph (87.27 km/h) |
| 55 mph (88.51 km/h) | 59.65 mph (96 km/h) |
| 60 mph (96.56 km/h) | 65.07 mph (104.73 km/h) |
| 65 mph (104.61 km/h) | 70.5 mph (113.45 km/h) |
| 70 mph (112.65 km/h) | 75.92 mph (122.18 km/h) |
| 75 mph (120.7 km/h) | 81.34 mph (130.91 km/h) |
| 80 mph (128.75 km/h) | 86.77 mph (139.64 km/h) |
| 85 mph (136.79 km/h) | 92.19 mph (148.36 km/h) |
| 90 mph (144.84 km/h) | 97.61 mph (157.09 km/h) |
| 95 mph (152.89 km/h) | 103.03 mph (165.82 km/h) |
| 100 mph (160.93 km/h) | 108.46 mph (174.55 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1334 | 1550 | 1669 | 1743 | 1822 | 1879 | 1941 | 2015 | 2117 | 2220 | 2333 | 2424 | 2589 | 2770 | 2912 | 3003 | 3054 | 3241 | 3503 | 4070 |
Better Fuel Economy Factory Ratios Increased Power
