Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-16 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.47 (926.4) | 30.98 (786.84) | -5.49 (-139.56) -15.1% |
| Width inches (mm) | 12.8 (325) | 10.51 (267) | -2.28 (-58) -17.8% |
| Circum. inches (mm) | 114.58 (2910.37) | 97.32 (2471.93) | -17.26 (-438.44) -15.1% |
| Sidewall Height inches (mm) | 10.24 (260) | 7.99 (202.92) | -2.25 (-57.08) -22% |
| Revolutions per mile (km) | 552.97 (343.6) | 651.05 (404.54) | 98.08 (60.94) 17.7% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.99 mph (27.34 km/h) |
| 25 mph (40.23 km/h) | 21.23 mph (34.17 km/h) |
| 30 mph (48.28 km/h) | 25.48 mph (41.01 km/h) |
| 35 mph (56.33 km/h) | 29.73 mph (47.84 km/h) |
| 40 mph (64.37 km/h) | 33.97 mph (54.68 km/h) |
| 45 mph (72.42 km/h) | 38.22 mph (61.51 km/h) |
| 50 mph (80.47 km/h) | 42.47 mph (68.35 km/h) |
| 55 mph (88.51 km/h) | 46.71 mph (75.18 km/h) |
| 60 mph (96.56 km/h) | 50.96 mph (82.01 km/h) |
| 65 mph (104.61 km/h) | 55.21 mph (88.85 km/h) |
| 70 mph (112.65 km/h) | 59.45 mph (95.68 km/h) |
| 75 mph (120.7 km/h) | 63.7 mph (102.52 km/h) |
| 80 mph (128.75 km/h) | 67.95 mph (109.35 km/h) |
| 85 mph (136.79 km/h) | 72.19 mph (116.19 km/h) |
| 90 mph (144.84 km/h) | 76.44 mph (123.02 km/h) |
| 95 mph (152.89 km/h) | 80.69 mph (129.86 km/h) |
| 100 mph (160.93 km/h) | 84.94 mph (136.69 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
