Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-17 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.41 (797.8) | 30.98 (786.84) | -0.43 (-10.96) -1.4% |
| Width inches (mm) | 12.01 (305) | 10.51 (267) | -1.5 (-38) -12.5% |
| Circum. inches (mm) | 98.68 (2506.36) | 97.32 (2471.93) | -1.36 (-34.43) -1.4% |
| Sidewall Height inches (mm) | 7.2 (183) | 7.99 (202.92) | 0.78 (19.92) 10.9% |
| Revolutions per mile (km) | 642.1 (398.98) | 651.05 (404.54) | 8.94 (5.56) 1.4% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.73 mph (31.74 km/h) |
| 25 mph (40.23 km/h) | 24.66 mph (39.68 km/h) |
| 30 mph (48.28 km/h) | 29.59 mph (47.62 km/h) |
| 35 mph (56.33 km/h) | 34.52 mph (55.55 km/h) |
| 40 mph (64.37 km/h) | 39.45 mph (63.49 km/h) |
| 45 mph (72.42 km/h) | 44.38 mph (71.43 km/h) |
| 50 mph (80.47 km/h) | 49.31 mph (79.36 km/h) |
| 55 mph (88.51 km/h) | 54.24 mph (87.3 km/h) |
| 60 mph (96.56 km/h) | 59.18 mph (95.23 km/h) |
| 65 mph (104.61 km/h) | 64.11 mph (103.17 km/h) |
| 70 mph (112.65 km/h) | 69.04 mph (111.11 km/h) |
| 75 mph (120.7 km/h) | 73.97 mph (119.04 km/h) |
| 80 mph (128.75 km/h) | 78.9 mph (126.98 km/h) |
| 85 mph (136.79 km/h) | 83.83 mph (134.92 km/h) |
| 90 mph (144.84 km/h) | 88.76 mph (142.85 km/h) |
| 95 mph (152.89 km/h) | 93.69 mph (150.79 km/h) |
| 100 mph (160.93 km/h) | 98.63 mph (158.72 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
