Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 345/50-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.58 (726) | 0.35 (8.8) 1.2% |
| Width inches (mm) | 12.8 (325) | 13.58 (345) | 0.79 (20) 6.2% |
| Circum. inches (mm) | 88.71 (2253.15) | 89.8 (2280.8) | 1.09 (27.65) 1.2% |
| Sidewall Height inches (mm) | 5.12 (130) | 6.79 (172.5) | 1.67 (42.5) 32.7% |
| Revolutions per mile (km) | 714.26 (443.82) | 705.61 (438.44) | -8.66 (-5.38) -1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.25 mph (32.58 km/h) |
| 25 mph (40.23 km/h) | 25.31 mph (40.73 km/h) |
| 30 mph (48.28 km/h) | 30.37 mph (48.87 km/h) |
| 35 mph (56.33 km/h) | 35.43 mph (57.02 km/h) |
| 40 mph (64.37 km/h) | 40.49 mph (65.16 km/h) |
| 45 mph (72.42 km/h) | 45.55 mph (73.31 km/h) |
| 50 mph (80.47 km/h) | 50.61 mph (81.45 km/h) |
| 55 mph (88.51 km/h) | 55.67 mph (89.6 km/h) |
| 60 mph (96.56 km/h) | 60.74 mph (97.75 km/h) |
| 65 mph (104.61 km/h) | 65.8 mph (105.89 km/h) |
| 70 mph (112.65 km/h) | 70.86 mph (114.04 km/h) |
| 75 mph (120.7 km/h) | 75.92 mph (122.18 km/h) |
| 80 mph (128.75 km/h) | 80.98 mph (130.33 km/h) |
| 85 mph (136.79 km/h) | 86.04 mph (138.47 km/h) |
| 90 mph (144.84 km/h) | 91.1 mph (146.62 km/h) |
| 95 mph (152.89 km/h) | 96.17 mph (154.76 km/h) |
| 100 mph (160.93 km/h) | 101.23 mph (162.91 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1796 | 2086 | 2246 | 2346 | 2453 | 2529 | 2613 | 2713 | 2850 | 2988 | 3140 | 3263 | 3484 | 3729 | 3920 | 4042 | 4111 | 4363 | 4714 | 5479 |
Better Fuel Economy Factory Ratios Increased Power
