Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-20 | 315/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.4 (670.5) | 36.12 (917.5) | 9.72 (247) 36.8% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 82.93 (2106.44) | 113.48 (2882.41) | 30.55 (775.97) 36.8% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 8.06 (204.75) | 4.86 (123.5) 152% |
| Revolutions per mile (km) | 764.01 (474.73) | 558.33 (346.93) | -205.68 (-127.8) -26.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.37 mph (44.04 km/h) |
| 25 mph (40.23 km/h) | 34.21 mph (55.06 km/h) |
| 30 mph (48.28 km/h) | 41.05 mph (66.07 km/h) |
| 35 mph (56.33 km/h) | 47.89 mph (77.08 km/h) |
| 40 mph (64.37 km/h) | 54.74 mph (88.09 km/h) |
| 45 mph (72.42 km/h) | 61.58 mph (99.1 km/h) |
| 50 mph (80.47 km/h) | 68.42 mph (110.11 km/h) |
| 55 mph (88.51 km/h) | 75.26 mph (121.12 km/h) |
| 60 mph (96.56 km/h) | 82.1 mph (132.13 km/h) |
| 65 mph (104.61 km/h) | 88.94 mph (143.14 km/h) |
| 70 mph (112.65 km/h) | 95.79 mph (154.15 km/h) |
| 75 mph (120.7 km/h) | 102.63 mph (165.17 km/h) |
| 80 mph (128.75 km/h) | 109.47 mph (176.18 km/h) |
| 85 mph (136.79 km/h) | 116.31 mph (187.19 km/h) |
| 90 mph (144.84 km/h) | 123.15 mph (198.2 km/h) |
| 95 mph (152.89 km/h) | 130 mph (209.21 km/h) |
| 100 mph (160.93 km/h) | 136.84 mph (220.22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1421 | 1651 | 1778 | 1856 | 1941 | 2001 | 2068 | 2146 | 2255 | 2364 | 2485 | 2582 | 2757 | 2951 | 3102 | 3198 | 3253 | 3452 | 3730 | 4335 |
Better Fuel Economy Factory Ratios Increased Power
