Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/75-18 | 325/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.6 (929.7) | 37.19 (944.7) | 0.59 (15) 1.6% |
| Width inches (mm) | 12.4 (315) | 12.8 (325) | 0.39 (10) 3.2% |
| Circum. inches (mm) | 114.99 (2920.74) | 116.84 (2967.86) | 1.86 (47.12) 1.6% |
| Sidewall Height inches (mm) | 9.3 (236.25) | 9.6 (243.75) | 0.3 (7.5) 3.2% |
| Revolutions per mile (km) | 551.01 (342.38) | 542.26 (336.94) | -8.75 (-5.44) -1.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.32 mph (32.71 km/h) |
| 25 mph (40.23 km/h) | 25.4 mph (40.88 km/h) |
| 30 mph (48.28 km/h) | 30.48 mph (49.06 km/h) |
| 35 mph (56.33 km/h) | 35.56 mph (57.24 km/h) |
| 40 mph (64.37 km/h) | 40.65 mph (65.41 km/h) |
| 45 mph (72.42 km/h) | 45.73 mph (73.59 km/h) |
| 50 mph (80.47 km/h) | 50.81 mph (81.77 km/h) |
| 55 mph (88.51 km/h) | 55.89 mph (89.94 km/h) |
| 60 mph (96.56 km/h) | 60.97 mph (98.12 km/h) |
| 65 mph (104.61 km/h) | 66.05 mph (106.3 km/h) |
| 70 mph (112.65 km/h) | 71.13 mph (114.47 km/h) |
| 75 mph (120.7 km/h) | 76.21 mph (122.65 km/h) |
| 80 mph (128.75 km/h) | 81.29 mph (130.83 km/h) |
| 85 mph (136.79 km/h) | 86.37 mph (139 km/h) |
| 90 mph (144.84 km/h) | 91.45 mph (147.18 km/h) |
| 95 mph (152.89 km/h) | 96.53 mph (155.35 km/h) |
| 100 mph (160.93 km/h) | 101.61 mph (163.53 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1380 | 1603 | 1726 | 1803 | 1885 | 1944 | 2008 | 2085 | 2190 | 2296 | 2413 | 2507 | 2678 | 2866 | 3012 | 3106 | 3159 | 3353 | 3623 | 4210 |
Better Fuel Economy Factory Ratios Increased Power
