Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-15 | 315/50-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (771) | 27.4 (696) | -2.95 (-75) -9.7% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 95.36 (2422.17) | 86.08 (2186.55) | -9.28 (-235.62) -9.7% |
| Sidewall Height inches (mm) | 7.68 (195) | 6.2 (157.5) | -1.48 (-37.5) -19.2% |
| Revolutions per mile (km) | 664.42 (412.85) | 736.02 (457.34) | 71.6 (44.49) 10.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.05 mph (29.06 km/h) |
| 25 mph (40.23 km/h) | 22.57 mph (36.32 km/h) |
| 30 mph (48.28 km/h) | 27.08 mph (43.58 km/h) |
| 35 mph (56.33 km/h) | 31.6 mph (50.85 km/h) |
| 40 mph (64.37 km/h) | 36.11 mph (58.11 km/h) |
| 45 mph (72.42 km/h) | 40.62 mph (65.38 km/h) |
| 50 mph (80.47 km/h) | 45.14 mph (72.64 km/h) |
| 55 mph (88.51 km/h) | 49.65 mph (79.9 km/h) |
| 60 mph (96.56 km/h) | 54.16 mph (87.17 km/h) |
| 65 mph (104.61 km/h) | 58.68 mph (94.43 km/h) |
| 70 mph (112.65 km/h) | 63.19 mph (101.7 km/h) |
| 75 mph (120.7 km/h) | 67.7 mph (108.96 km/h) |
| 80 mph (128.75 km/h) | 72.22 mph (116.22 km/h) |
| 85 mph (136.79 km/h) | 76.73 mph (123.49 km/h) |
| 90 mph (144.84 km/h) | 81.25 mph (130.75 km/h) |
| 95 mph (152.89 km/h) | 85.76 mph (138.02 km/h) |
| 100 mph (160.93 km/h) | 90.27 mph (145.28 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1873 | 2176 | 2343 | 2447 | 2558 | 2638 | 2726 | 2829 | 2973 | 3116 | 3276 | 3403 | 3634 | 3890 | 4089 | 4216 | 4288 | 4551 | 4918 | 5715 |
Better Fuel Economy Factory Ratios Increased Power
