Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-15 | 31/12-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (771) | 31.09 (789.7) | 0.74 (18.7) 2.4% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 95.36 (2422.17) | 97.67 (2480.92) | 2.31 (58.75) 2.4% |
| Sidewall Height inches (mm) | 7.68 (195) | 8.05 (204.35) | 0.37 (9.35) 4.8% |
| Revolutions per mile (km) | 664.42 (412.85) | 648.69 (403.08) | -15.73 (-9.78) -2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.49 mph (32.97 km/h) |
| 25 mph (40.23 km/h) | 25.61 mph (41.21 km/h) |
| 30 mph (48.28 km/h) | 30.73 mph (49.45 km/h) |
| 35 mph (56.33 km/h) | 35.85 mph (57.69 km/h) |
| 40 mph (64.37 km/h) | 40.97 mph (65.94 km/h) |
| 45 mph (72.42 km/h) | 46.09 mph (74.18 km/h) |
| 50 mph (80.47 km/h) | 51.21 mph (82.42 km/h) |
| 55 mph (88.51 km/h) | 56.33 mph (90.66 km/h) |
| 60 mph (96.56 km/h) | 61.46 mph (98.9 km/h) |
| 65 mph (104.61 km/h) | 66.58 mph (107.14 km/h) |
| 70 mph (112.65 km/h) | 71.7 mph (115.39 km/h) |
| 75 mph (120.7 km/h) | 76.82 mph (123.63 km/h) |
| 80 mph (128.75 km/h) | 81.94 mph (131.87 km/h) |
| 85 mph (136.79 km/h) | 87.06 mph (140.11 km/h) |
| 90 mph (144.84 km/h) | 92.18 mph (148.35 km/h) |
| 95 mph (152.89 km/h) | 97.3 mph (156.6 km/h) |
| 100 mph (160.93 km/h) | 102.43 mph (164.84 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1651 | 1918 | 2065 | 2157 | 2255 | 2325 | 2402 | 2494 | 2620 | 2747 | 2887 | 3000 | 3203 | 3428 | 3604 | 3716 | 3779 | 4011 | 4334 | 5037 |
Better Fuel Economy Factory Ratios Increased Power
