Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 325/59-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 33.1 (840.7) | 4.86 (123.5) 17.2% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 88.71 (2253.15) | 103.98 (2641.14) | 15.28 (387.99) 17.2% |
| Sidewall Height inches (mm) | 5.12 (130) | 7.55 (191.75) | 2.43 (61.75) 47.5% |
| Revolutions per mile (km) | 714.26 (443.82) | 609.34 (378.62) | -104.93 (-65.2) -14.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.44 mph (37.73 km/h) |
| 25 mph (40.23 km/h) | 29.3 mph (47.16 km/h) |
| 30 mph (48.28 km/h) | 35.17 mph (56.59 km/h) |
| 35 mph (56.33 km/h) | 41.03 mph (66.03 km/h) |
| 40 mph (64.37 km/h) | 46.89 mph (75.46 km/h) |
| 45 mph (72.42 km/h) | 52.75 mph (84.89 km/h) |
| 50 mph (80.47 km/h) | 58.61 mph (94.32 km/h) |
| 55 mph (88.51 km/h) | 64.47 mph (103.76 km/h) |
| 60 mph (96.56 km/h) | 70.33 mph (113.19 km/h) |
| 65 mph (104.61 km/h) | 76.19 mph (122.62 km/h) |
| 70 mph (112.65 km/h) | 82.05 mph (132.05 km/h) |
| 75 mph (120.7 km/h) | 87.91 mph (141.49 km/h) |
| 80 mph (128.75 km/h) | 93.78 mph (150.92 km/h) |
| 85 mph (136.79 km/h) | 99.64 mph (160.35 km/h) |
| 90 mph (144.84 km/h) | 105.5 mph (169.78 km/h) |
| 95 mph (152.89 km/h) | 111.36 mph (179.21 km/h) |
| 100 mph (160.93 km/h) | 117.22 mph (188.65 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1551 | 1801 | 1940 | 2026 | 2118 | 2184 | 2257 | 2342 | 2461 | 2580 | 2712 | 2818 | 3009 | 3220 | 3385 | 3491 | 3550 | 3768 | 4071 | 4731 |
Better Fuel Economy Factory Ratios Increased Power
