Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/70-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.71 (780) | 30.98 (786.84) | 0.27 (6.84) 0.9% |
| Width inches (mm) | 11.22 (285) | 10.51 (267) | -0.71 (-18) -6.3% |
| Circum. inches (mm) | 96.47 (2450.44) | 97.32 (2471.93) | 0.85 (21.49) 0.9% |
| Sidewall Height inches (mm) | 7.85 (199.5) | 7.99 (202.92) | 0.13 (3.42) 1.7% |
| Revolutions per mile (km) | 656.76 (408.09) | 651.05 (404.54) | -5.71 (-3.55) -0.9% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.18 mph (32.47 km/h) |
| 25 mph (40.23 km/h) | 25.22 mph (40.59 km/h) |
| 30 mph (48.28 km/h) | 30.26 mph (48.7 km/h) |
| 35 mph (56.33 km/h) | 35.31 mph (56.82 km/h) |
| 40 mph (64.37 km/h) | 40.35 mph (64.94 km/h) |
| 45 mph (72.42 km/h) | 45.39 mph (73.06 km/h) |
| 50 mph (80.47 km/h) | 50.44 mph (81.17 km/h) |
| 55 mph (88.51 km/h) | 55.48 mph (89.29 km/h) |
| 60 mph (96.56 km/h) | 60.53 mph (97.41 km/h) |
| 65 mph (104.61 km/h) | 65.57 mph (105.52 km/h) |
| 70 mph (112.65 km/h) | 70.61 mph (113.64 km/h) |
| 75 mph (120.7 km/h) | 75.66 mph (121.76 km/h) |
| 80 mph (128.75 km/h) | 80.7 mph (129.88 km/h) |
| 85 mph (136.79 km/h) | 85.75 mph (137.99 km/h) |
| 90 mph (144.84 km/h) | 90.79 mph (146.11 km/h) |
| 95 mph (152.89 km/h) | 95.83 mph (154.23 km/h) |
| 100 mph (160.93 km/h) | 100.88 mph (162.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1657 | 1925 | 2073 | 2164 | 2263 | 2334 | 2411 | 2503 | 2630 | 2757 | 2898 | 3010 | 3215 | 3440 | 3617 | 3730 | 3793 | 4026 | 4350 | 5055 |
Better Fuel Economy Factory Ratios Increased Power
