Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 315/80-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 36.84 (935.8) | 1.37 (34.8) 3.9% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 111.44 (2830.57) | 115.74 (2939.9) | 4.3 (109.33) 3.9% |
| Sidewall Height inches (mm) | 10.24 (260) | 9.92 (252) | -0.31 (-8) -3.1% |
| Revolutions per mile (km) | 568.56 (353.28) | 547.41 (340.15) | -21.14 (-13.14) -3.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.77 mph (33.43 km/h) |
| 25 mph (40.23 km/h) | 25.97 mph (41.79 km/h) |
| 30 mph (48.28 km/h) | 31.16 mph (50.15 km/h) |
| 35 mph (56.33 km/h) | 36.35 mph (58.5 km/h) |
| 40 mph (64.37 km/h) | 41.54 mph (66.86 km/h) |
| 45 mph (72.42 km/h) | 46.74 mph (75.22 km/h) |
| 50 mph (80.47 km/h) | 51.93 mph (83.58 km/h) |
| 55 mph (88.51 km/h) | 57.12 mph (91.93 km/h) |
| 60 mph (96.56 km/h) | 62.32 mph (100.29 km/h) |
| 65 mph (104.61 km/h) | 67.51 mph (108.65 km/h) |
| 70 mph (112.65 km/h) | 72.7 mph (117.01 km/h) |
| 75 mph (120.7 km/h) | 77.9 mph (125.36 km/h) |
| 80 mph (128.75 km/h) | 83.09 mph (133.72 km/h) |
| 85 mph (136.79 km/h) | 88.28 mph (142.08 km/h) |
| 90 mph (144.84 km/h) | 93.48 mph (150.44 km/h) |
| 95 mph (152.89 km/h) | 98.67 mph (158.79 km/h) |
| 100 mph (160.93 km/h) | 103.86 mph (167.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1393 | 1618 | 1743 | 1820 | 1903 | 1962 | 2027 | 2104 | 2211 | 2318 | 2436 | 2531 | 2703 | 2893 | 3041 | 3136 | 3189 | 3385 | 3658 | 4250 |
Better Fuel Economy Factory Ratios Increased Power
