Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 315/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 36.12 (917.5) | 9.92 (252) 37.9% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 82.31 (2090.73) | 113.48 (2882.41) | 31.17 (791.68) 37.9% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 8.06 (204.75) | 4.96 (126) 160% |
| Revolutions per mile (km) | 769.75 (478.3) | 558.33 (346.93) | -211.42 (-131.37) -27.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.57 mph (44.37 km/h) |
| 25 mph (40.23 km/h) | 34.47 mph (55.47 km/h) |
| 30 mph (48.28 km/h) | 41.36 mph (66.56 km/h) |
| 35 mph (56.33 km/h) | 48.25 mph (77.66 km/h) |
| 40 mph (64.37 km/h) | 55.15 mph (88.75 km/h) |
| 45 mph (72.42 km/h) | 62.04 mph (99.84 km/h) |
| 50 mph (80.47 km/h) | 68.93 mph (110.94 km/h) |
| 55 mph (88.51 km/h) | 75.83 mph (122.03 km/h) |
| 60 mph (96.56 km/h) | 82.72 mph (133.12 km/h) |
| 65 mph (104.61 km/h) | 89.61 mph (144.22 km/h) |
| 70 mph (112.65 km/h) | 96.51 mph (155.31 km/h) |
| 75 mph (120.7 km/h) | 103.4 mph (166.41 km/h) |
| 80 mph (128.75 km/h) | 110.29 mph (177.5 km/h) |
| 85 mph (136.79 km/h) | 117.19 mph (188.59 km/h) |
| 90 mph (144.84 km/h) | 124.08 mph (199.69 km/h) |
| 95 mph (152.89 km/h) | 130.97 mph (210.78 km/h) |
| 100 mph (160.93 km/h) | 137.87 mph (221.87 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
