Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 375/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 37.19 (944.7) | 1.72 (43.7) 4.9% |
| Width inches (mm) | 12.8 (325) | 14.76 (375) | 1.97 (50) 15.4% |
| Circum. inches (mm) | 111.44 (2830.57) | 116.84 (2967.86) | 5.41 (137.29) 4.9% |
| Sidewall Height inches (mm) | 10.24 (260) | 9.6 (243.75) | -0.64 (-16.25) -6.3% |
| Revolutions per mile (km) | 568.56 (353.28) | 542.26 (336.94) | -26.3 (-16.34) -4.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.97 mph (33.75 km/h) |
| 25 mph (40.23 km/h) | 26.21 mph (42.19 km/h) |
| 30 mph (48.28 km/h) | 31.46 mph (50.62 km/h) |
| 35 mph (56.33 km/h) | 36.7 mph (59.06 km/h) |
| 40 mph (64.37 km/h) | 41.94 mph (67.5 km/h) |
| 45 mph (72.42 km/h) | 47.18 mph (75.93 km/h) |
| 50 mph (80.47 km/h) | 52.43 mph (84.37 km/h) |
| 55 mph (88.51 km/h) | 57.67 mph (92.81 km/h) |
| 60 mph (96.56 km/h) | 62.91 mph (101.24 km/h) |
| 65 mph (104.61 km/h) | 68.15 mph (109.68 km/h) |
| 70 mph (112.65 km/h) | 73.4 mph (118.12 km/h) |
| 75 mph (120.7 km/h) | 78.64 mph (126.56 km/h) |
| 80 mph (128.75 km/h) | 83.88 mph (134.99 km/h) |
| 85 mph (136.79 km/h) | 89.12 mph (143.43 km/h) |
| 90 mph (144.84 km/h) | 94.37 mph (151.87 km/h) |
| 95 mph (152.89 km/h) | 99.61 mph (160.3 km/h) |
| 100 mph (160.93 km/h) | 104.85 mph (168.74 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
