Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 385/35-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.61 (726.7) | 0.37 (9.5) 1.3% |
| Width inches (mm) | 12.8 (325) | 15.16 (385) | 2.36 (60) 18.5% |
| Circum. inches (mm) | 88.71 (2253.15) | 89.88 (2283) | 1.18 (29.85) 1.3% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.31 (134.75) | 0.19 (4.75) 3.7% |
| Revolutions per mile (km) | 714.26 (443.82) | 704.93 (438.02) | -9.34 (-5.8) -1.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.26 mph (32.61 km/h) |
| 25 mph (40.23 km/h) | 25.33 mph (40.77 km/h) |
| 30 mph (48.28 km/h) | 30.4 mph (48.92 km/h) |
| 35 mph (56.33 km/h) | 35.46 mph (57.07 km/h) |
| 40 mph (64.37 km/h) | 40.53 mph (65.23 km/h) |
| 45 mph (72.42 km/h) | 45.6 mph (73.38 km/h) |
| 50 mph (80.47 km/h) | 50.66 mph (81.53 km/h) |
| 55 mph (88.51 km/h) | 55.73 mph (89.69 km/h) |
| 60 mph (96.56 km/h) | 60.79 mph (97.84 km/h) |
| 65 mph (104.61 km/h) | 65.86 mph (105.99 km/h) |
| 70 mph (112.65 km/h) | 70.93 mph (114.15 km/h) |
| 75 mph (120.7 km/h) | 75.99 mph (122.3 km/h) |
| 80 mph (128.75 km/h) | 81.06 mph (130.45 km/h) |
| 85 mph (136.79 km/h) | 86.13 mph (138.61 km/h) |
| 90 mph (144.84 km/h) | 91.19 mph (146.76 km/h) |
| 95 mph (152.89 km/h) | 96.26 mph (154.91 km/h) |
| 100 mph (160.93 km/h) | 101.32 mph (163.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1794 | 2084 | 2244 | 2344 | 2450 | 2527 | 2611 | 2710 | 2847 | 2985 | 3137 | 3260 | 3481 | 3725 | 3916 | 4038 | 4107 | 4359 | 4710 | 5473 |
Better Fuel Economy Factory Ratios Increased Power
