Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-15 | 315/60-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (771) | 31.88 (809.8) | 1.53 (38.8) 5% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 95.36 (2422.17) | 100.16 (2544.06) | 4.8 (121.89) 5% |
| Sidewall Height inches (mm) | 7.68 (195) | 7.44 (189) | -0.24 (-6) -3.1% |
| Revolutions per mile (km) | 664.42 (412.85) | 632.59 (393.07) | -31.83 (-19.78) -4.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.01 mph (33.81 km/h) |
| 25 mph (40.23 km/h) | 26.26 mph (42.26 km/h) |
| 30 mph (48.28 km/h) | 31.51 mph (50.71 km/h) |
| 35 mph (56.33 km/h) | 36.76 mph (59.16 km/h) |
| 40 mph (64.37 km/h) | 42.01 mph (67.61 km/h) |
| 45 mph (72.42 km/h) | 47.26 mph (76.07 km/h) |
| 50 mph (80.47 km/h) | 52.52 mph (84.52 km/h) |
| 55 mph (88.51 km/h) | 57.77 mph (92.97 km/h) |
| 60 mph (96.56 km/h) | 63.02 mph (101.42 km/h) |
| 65 mph (104.61 km/h) | 68.27 mph (109.87 km/h) |
| 70 mph (112.65 km/h) | 73.52 mph (118.32 km/h) |
| 75 mph (120.7 km/h) | 78.77 mph (126.78 km/h) |
| 80 mph (128.75 km/h) | 84.03 mph (135.23 km/h) |
| 85 mph (136.79 km/h) | 89.28 mph (143.68 km/h) |
| 90 mph (144.84 km/h) | 94.53 mph (152.13 km/h) |
| 95 mph (152.89 km/h) | 99.78 mph (160.58 km/h) |
| 100 mph (160.93 km/h) | 105.03 mph (169.03 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1610 | 1870 | 2014 | 2103 | 2199 | 2267 | 2343 | 2432 | 2555 | 2678 | 2815 | 2925 | 3124 | 3343 | 3514 | 3624 | 3685 | 3912 | 4227 | 4912 |
Better Fuel Economy Factory Ratios Increased Power
