Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-20 | 315/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.4 (670.5) | 27.44 (697) | 1.04 (26.5) 4% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 82.93 (2106.44) | 86.21 (2189.69) | 3.28 (83.25) 4% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 3.72 (94.5) | 0.52 (13.25) 16.3% |
| Revolutions per mile (km) | 764.01 (474.73) | 734.96 (456.68) | -29.05 (-18.05) -3.8% |
315/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.79 mph (33.46 km/h) |
| 25 mph (40.23 km/h) | 25.99 mph (41.82 km/h) |
| 30 mph (48.28 km/h) | 31.19 mph (50.19 km/h) |
| 35 mph (56.33 km/h) | 36.38 mph (58.55 km/h) |
| 40 mph (64.37 km/h) | 41.58 mph (66.92 km/h) |
| 45 mph (72.42 km/h) | 46.78 mph (75.28 km/h) |
| 50 mph (80.47 km/h) | 51.98 mph (83.65 km/h) |
| 55 mph (88.51 km/h) | 57.17 mph (92.01 km/h) |
| 60 mph (96.56 km/h) | 62.37 mph (100.38 km/h) |
| 65 mph (104.61 km/h) | 67.57 mph (108.74 km/h) |
| 70 mph (112.65 km/h) | 72.77 mph (117.11 km/h) |
| 75 mph (120.7 km/h) | 77.96 mph (125.47 km/h) |
| 80 mph (128.75 km/h) | 83.16 mph (133.84 km/h) |
| 85 mph (136.79 km/h) | 88.36 mph (142.2 km/h) |
| 90 mph (144.84 km/h) | 93.56 mph (150.57 km/h) |
| 95 mph (152.89 km/h) | 98.75 mph (158.93 km/h) |
| 100 mph (160.93 km/h) | 103.95 mph (167.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1870 | 2173 | 2340 | 2443 | 2555 | 2634 | 2722 | 2825 | 2969 | 3112 | 3271 | 3398 | 3629 | 3884 | 4083 | 4210 | 4282 | 4545 | 4911 | 5707 |
Better Fuel Economy Factory Ratios Increased Power
