Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 345/45-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 27.22 (691.5) | -1.01 (-25.7) -3.6% |
| Width inches (mm) | 12.8 (325) | 13.58 (345) | 0.79 (20) 6.2% |
| Circum. inches (mm) | 88.71 (2253.15) | 85.53 (2172.41) | -3.18 (-80.74) -3.6% |
| Sidewall Height inches (mm) | 5.12 (130) | 6.11 (155.25) | 0.99 (25.25) 19.4% |
| Revolutions per mile (km) | 714.26 (443.82) | 740.81 (460.32) | 26.55 (16.49) 3.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.28 mph (31.03 km/h) |
| 25 mph (40.23 km/h) | 24.1 mph (38.79 km/h) |
| 30 mph (48.28 km/h) | 28.92 mph (46.55 km/h) |
| 35 mph (56.33 km/h) | 33.75 mph (54.31 km/h) |
| 40 mph (64.37 km/h) | 38.57 mph (62.07 km/h) |
| 45 mph (72.42 km/h) | 43.39 mph (69.83 km/h) |
| 50 mph (80.47 km/h) | 48.21 mph (77.58 km/h) |
| 55 mph (88.51 km/h) | 53.03 mph (85.34 km/h) |
| 60 mph (96.56 km/h) | 57.85 mph (93.1 km/h) |
| 65 mph (104.61 km/h) | 62.67 mph (100.86 km/h) |
| 70 mph (112.65 km/h) | 67.49 mph (108.62 km/h) |
| 75 mph (120.7 km/h) | 72.31 mph (116.38 km/h) |
| 80 mph (128.75 km/h) | 77.13 mph (124.13 km/h) |
| 85 mph (136.79 km/h) | 81.95 mph (131.89 km/h) |
| 90 mph (144.84 km/h) | 86.77 mph (139.65 km/h) |
| 95 mph (152.89 km/h) | 91.6 mph (147.41 km/h) |
| 100 mph (160.93 km/h) | 96.42 mph (155.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1885 | 2190 | 2359 | 2463 | 2575 | 2655 | 2744 | 2848 | 2992 | 3137 | 3297 | 3425 | 3658 | 3915 | 4115 | 4244 | 4316 | 4581 | 4950 | 5752 |
Better Fuel Economy Factory Ratios Increased Power
