Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 28/10.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.09 (713.52) | -0.14 (-3.68) -0.5% |
| Width inches (mm) | 12.8 (325) | 10.51 (267) | -2.28 (-58) -17.8% |
| Circum. inches (mm) | 88.71 (2253.15) | 88.25 (2241.59) | -0.46 (-11.56) -0.5% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.05 (128.16) | -0.07 (-1.84) -1.4% |
| Revolutions per mile (km) | 714.26 (443.82) | 717.95 (446.11) | 3.68 (2.29) 0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.9 mph (32.02 km/h) |
| 25 mph (40.23 km/h) | 24.87 mph (40.03 km/h) |
| 30 mph (48.28 km/h) | 29.85 mph (48.03 km/h) |
| 35 mph (56.33 km/h) | 34.82 mph (56.04 km/h) |
| 40 mph (64.37 km/h) | 39.79 mph (64.04 km/h) |
| 45 mph (72.42 km/h) | 44.77 mph (72.05 km/h) |
| 50 mph (80.47 km/h) | 49.74 mph (80.05 km/h) |
| 55 mph (88.51 km/h) | 54.72 mph (88.06 km/h) |
| 60 mph (96.56 km/h) | 59.69 mph (96.07 km/h) |
| 65 mph (104.61 km/h) | 64.67 mph (104.07 km/h) |
| 70 mph (112.65 km/h) | 69.64 mph (112.08 km/h) |
| 75 mph (120.7 km/h) | 74.62 mph (120.08 km/h) |
| 80 mph (128.75 km/h) | 79.59 mph (128.09 km/h) |
| 85 mph (136.79 km/h) | 84.56 mph (136.09 km/h) |
| 90 mph (144.84 km/h) | 89.54 mph (144.1 km/h) |
| 95 mph (152.89 km/h) | 94.51 mph (152.1 km/h) |
| 100 mph (160.93 km/h) | 99.49 mph (160.11 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1827 | 2122 | 2286 | 2387 | 2496 | 2573 | 2659 | 2760 | 2900 | 3040 | 3195 | 3320 | 3545 | 3794 | 3988 | 4113 | 4183 | 4439 | 4797 | 5574 |
Better Fuel Economy Factory Ratios Increased Power
