Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/80-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.91 (709) | 30.98 (786.84) | 3.06 (77.84) 11% |
| Width inches (mm) | 8.07 (205) | 10.51 (267) | 2.44 (62) 30.2% |
| Circum. inches (mm) | 87.69 (2227.39) | 97.32 (2471.93) | 9.63 (244.54) 11% |
| Sidewall Height inches (mm) | 6.46 (164) | 7.99 (202.92) | 1.53 (38.92) 23.7% |
| Revolutions per mile (km) | 722.52 (448.96) | 651.05 (404.54) | -71.48 (-44.41) -9.9% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.2 mph (35.72 km/h) |
| 25 mph (40.23 km/h) | 27.74 mph (44.65 km/h) |
| 30 mph (48.28 km/h) | 33.29 mph (53.58 km/h) |
| 35 mph (56.33 km/h) | 38.84 mph (62.51 km/h) |
| 40 mph (64.37 km/h) | 44.39 mph (71.44 km/h) |
| 45 mph (72.42 km/h) | 49.94 mph (80.37 km/h) |
| 50 mph (80.47 km/h) | 55.49 mph (89.3 km/h) |
| 55 mph (88.51 km/h) | 61.04 mph (98.23 km/h) |
| 60 mph (96.56 km/h) | 66.59 mph (107.16 km/h) |
| 65 mph (104.61 km/h) | 72.14 mph (116.09 km/h) |
| 70 mph (112.65 km/h) | 77.69 mph (125.02 km/h) |
| 75 mph (120.7 km/h) | 83.23 mph (133.95 km/h) |
| 80 mph (128.75 km/h) | 88.78 mph (142.88 km/h) |
| 85 mph (136.79 km/h) | 94.33 mph (151.81 km/h) |
| 90 mph (144.84 km/h) | 99.88 mph (160.74 km/h) |
| 95 mph (152.89 km/h) | 105.43 mph (169.67 km/h) |
| 100 mph (160.93 km/h) | 110.98 mph (178.6 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
