Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-20 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.22 (793) | 30.98 (786.84) | -0.24 (-6.16) -0.8% |
| Width inches (mm) | 11.22 (285) | 10.51 (267) | -0.71 (-18) -6.3% |
| Circum. inches (mm) | 98.08 (2491.28) | 97.32 (2471.93) | -0.76 (-19.35) -0.8% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 7.99 (202.92) | 2.38 (60.42) 42.4% |
| Revolutions per mile (km) | 645.99 (401.4) | 651.05 (404.54) | 5.06 (3.14) 0.8% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.84 mph (31.94 km/h) |
| 25 mph (40.23 km/h) | 24.81 mph (39.92 km/h) |
| 30 mph (48.28 km/h) | 29.77 mph (47.91 km/h) |
| 35 mph (56.33 km/h) | 34.73 mph (55.89 km/h) |
| 40 mph (64.37 km/h) | 39.69 mph (63.87 km/h) |
| 45 mph (72.42 km/h) | 44.65 mph (71.86 km/h) |
| 50 mph (80.47 km/h) | 49.61 mph (79.84 km/h) |
| 55 mph (88.51 km/h) | 54.57 mph (87.83 km/h) |
| 60 mph (96.56 km/h) | 59.53 mph (95.81 km/h) |
| 65 mph (104.61 km/h) | 64.5 mph (103.79 km/h) |
| 70 mph (112.65 km/h) | 69.46 mph (111.78 km/h) |
| 75 mph (120.7 km/h) | 74.42 mph (119.76 km/h) |
| 80 mph (128.75 km/h) | 79.38 mph (127.75 km/h) |
| 85 mph (136.79 km/h) | 84.34 mph (135.73 km/h) |
| 90 mph (144.84 km/h) | 89.3 mph (143.72 km/h) |
| 95 mph (152.89 km/h) | 94.26 mph (151.7 km/h) |
| 100 mph (160.93 km/h) | 99.22 mph (159.68 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
