Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-20 | 315/25-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.4 (670.5) | 26.2 (665.5) | -0.2 (-5) -0.7% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 82.93 (2106.44) | 82.31 (2090.73) | -0.62 (-15.71) -0.7% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 3.1 (78.75) | -0.1 (-2.5) -3.1% |
| Revolutions per mile (km) | 764.01 (474.73) | 769.75 (478.3) | 5.74 (3.57) 0.8% |
315/25-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.85 mph (31.95 km/h) |
| 25 mph (40.23 km/h) | 24.81 mph (39.93 km/h) |
| 30 mph (48.28 km/h) | 29.78 mph (47.92 km/h) |
| 35 mph (56.33 km/h) | 34.74 mph (55.91 km/h) |
| 40 mph (64.37 km/h) | 39.7 mph (63.89 km/h) |
| 45 mph (72.42 km/h) | 44.66 mph (71.88 km/h) |
| 50 mph (80.47 km/h) | 49.63 mph (79.87 km/h) |
| 55 mph (88.51 km/h) | 54.59 mph (87.85 km/h) |
| 60 mph (96.56 km/h) | 59.55 mph (95.84 km/h) |
| 65 mph (104.61 km/h) | 64.52 mph (103.83 km/h) |
| 70 mph (112.65 km/h) | 69.48 mph (111.81 km/h) |
| 75 mph (120.7 km/h) | 74.44 mph (119.8 km/h) |
| 80 mph (128.75 km/h) | 79.4 mph (127.79 km/h) |
| 85 mph (136.79 km/h) | 84.37 mph (135.77 km/h) |
| 90 mph (144.84 km/h) | 89.33 mph (143.76 km/h) |
| 95 mph (152.89 km/h) | 94.29 mph (151.75 km/h) |
| 100 mph (160.93 km/h) | 99.25 mph (159.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1959 | 2276 | 2451 | 2559 | 2676 | 2759 | 2851 | 2959 | 3109 | 3259 | 3426 | 3559 | 3801 | 4068 | 4276 | 4410 | 4485 | 4760 | 5143 | 5977 |
Better Fuel Economy Factory Ratios Increased Power
