Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 325/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 37.91 (963) | 2.44 (62) 6.9% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 111.44 (2830.57) | 119.11 (3025.35) | 7.67 (194.78) 6.9% |
| Sidewall Height inches (mm) | 10.24 (260) | 8.96 (227.5) | -1.28 (-32.5) -12.5% |
| Revolutions per mile (km) | 568.56 (353.28) | 531.95 (330.54) | -36.6 (-22.75) -6.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.38 mph (34.4 km/h) |
| 25 mph (40.23 km/h) | 26.72 mph (43 km/h) |
| 30 mph (48.28 km/h) | 32.06 mph (51.6 km/h) |
| 35 mph (56.33 km/h) | 37.41 mph (60.2 km/h) |
| 40 mph (64.37 km/h) | 42.75 mph (68.8 km/h) |
| 45 mph (72.42 km/h) | 48.1 mph (77.4 km/h) |
| 50 mph (80.47 km/h) | 53.44 mph (86 km/h) |
| 55 mph (88.51 km/h) | 58.78 mph (94.6 km/h) |
| 60 mph (96.56 km/h) | 64.13 mph (103.21 km/h) |
| 65 mph (104.61 km/h) | 69.47 mph (111.81 km/h) |
| 70 mph (112.65 km/h) | 74.82 mph (120.41 km/h) |
| 75 mph (120.7 km/h) | 80.16 mph (129.01 km/h) |
| 80 mph (128.75 km/h) | 85.5 mph (137.61 km/h) |
| 85 mph (136.79 km/h) | 90.85 mph (146.21 km/h) |
| 90 mph (144.84 km/h) | 96.19 mph (154.81 km/h) |
| 95 mph (152.89 km/h) | 101.54 mph (163.41 km/h) |
| 100 mph (160.93 km/h) | 106.88 mph (172.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1354 | 1573 | 1694 | 1768 | 1849 | 1907 | 1970 | 2045 | 2149 | 2252 | 2368 | 2460 | 2627 | 2811 | 2955 | 3047 | 3099 | 3289 | 3554 | 4130 |
Better Fuel Economy Factory Ratios Increased Power
