Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 325/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 36.63 (930.5) | -1.36 (-34.54) -3.6% |
| Width inches (mm) | 15.51 (394) | 12.8 (325) | -2.72 (-69) -17.5% |
| Circum. inches (mm) | 119.36 (3031.76) | 115.09 (2923.25) | -4.27 (-108.51) -3.6% |
| Sidewall Height inches (mm) | 9 (228.52) | 8.32 (211.25) | -0.68 (-17.27) -7.6% |
| Revolutions per mile (km) | 530.83 (329.84) | 550.53 (342.08) | 19.7 (12.24) 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) | 24.11 mph (38.79 km/h) |
| 30 mph (48.28 km/h) | 28.93 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 (77.59 km/h) |
| 55 mph (88.51 km/h) | 53.03 mph (85.35 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) | 72.32 mph (116.38 km/h) |
| 80 mph (128.75 km/h) | 77.14 mph (124.14 km/h) |
| 85 mph (136.79 km/h) | 81.96 mph (131.9 km/h) |
| 90 mph (144.84 km/h) | 86.78 mph (139.66 km/h) |
| 95 mph (152.89 km/h) | 91.6 mph (147.42 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1401 | 1628 | 1753 | 1830 | 1914 | 1973 | 2039 | 2116 | 2224 | 2331 | 2450 | 2546 | 2719 | 2909 | 3058 | 3154 | 3207 | 3404 | 3678 | 4275 |
Better Fuel Economy Factory Ratios Increased Power
