Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/65-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.03 (686.5) | 30.98 (786.84) | 3.95 (100.34) 14.6% |
| Width inches (mm) | 9.25 (235) | 10.51 (267) | 1.26 (32) 13.6% |
| Circum. inches (mm) | 84.91 (2156.7) | 97.32 (2471.93) | 12.41 (315.23) 14.6% |
| Sidewall Height inches (mm) | 6.01 (152.75) | 7.99 (202.92) | 1.98 (50.17) 32.8% |
| Revolutions per mile (km) | 746.21 (463.67) | 651.05 (404.54) | -95.16 (-59.13) -12.8% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.92 mph (36.89 km/h) |
| 25 mph (40.23 km/h) | 28.65 mph (46.11 km/h) |
| 30 mph (48.28 km/h) | 34.38 mph (55.34 km/h) |
| 35 mph (56.33 km/h) | 40.12 mph (64.56 km/h) |
| 40 mph (64.37 km/h) | 45.85 mph (73.78 km/h) |
| 45 mph (72.42 km/h) | 51.58 mph (83.01 km/h) |
| 50 mph (80.47 km/h) | 57.31 mph (92.23 km/h) |
| 55 mph (88.51 km/h) | 63.04 mph (101.45 km/h) |
| 60 mph (96.56 km/h) | 68.77 mph (110.67 km/h) |
| 65 mph (104.61 km/h) | 74.5 mph (119.9 km/h) |
| 70 mph (112.65 km/h) | 80.23 mph (129.12 km/h) |
| 75 mph (120.7 km/h) | 85.96 mph (138.34 km/h) |
| 80 mph (128.75 km/h) | 91.69 mph (147.57 km/h) |
| 85 mph (136.79 km/h) | 97.42 mph (156.79 km/h) |
| 90 mph (144.84 km/h) | 103.15 mph (166.01 km/h) |
| 95 mph (152.89 km/h) | 108.89 mph (175.23 km/h) |
| 100 mph (160.93 km/h) | 114.62 mph (184.46 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
