Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/70-18 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.5 (800.2) | 30.98 (786.84) | -0.53 (-13.36) -1.7% |
| Width inches (mm) | 9.65 (245) | 10.51 (267) | 0.87 (22) 9% |
| Circum. inches (mm) | 98.97 (2513.9) | 97.32 (2471.93) | -1.65 (-41.97) -1.7% |
| Sidewall Height inches (mm) | 6.75 (171.5) | 7.99 (202.92) | 1.24 (31.42) 18.3% |
| Revolutions per mile (km) | 640.18 (397.79) | 651.05 (404.54) | 10.87 (6.75) 1.7% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.67 mph (31.65 km/h) |
| 25 mph (40.23 km/h) | 24.58 mph (39.56 km/h) |
| 30 mph (48.28 km/h) | 29.5 mph (47.47 km/h) |
| 35 mph (56.33 km/h) | 34.42 mph (55.39 km/h) |
| 40 mph (64.37 km/h) | 39.33 mph (63.3 km/h) |
| 45 mph (72.42 km/h) | 44.25 mph (71.21 km/h) |
| 50 mph (80.47 km/h) | 49.17 mph (79.12 km/h) |
| 55 mph (88.51 km/h) | 54.08 mph (87.04 km/h) |
| 60 mph (96.56 km/h) | 59 mph (94.95 km/h) |
| 65 mph (104.61 km/h) | 63.91 mph (102.86 km/h) |
| 70 mph (112.65 km/h) | 68.83 mph (110.77 km/h) |
| 75 mph (120.7 km/h) | 73.75 mph (118.69 km/h) |
| 80 mph (128.75 km/h) | 78.66 mph (126.6 km/h) |
| 85 mph (136.79 km/h) | 83.58 mph (134.51 km/h) |
| 90 mph (144.84 km/h) | 88.5 mph (142.42 km/h) |
| 95 mph (152.89 km/h) | 93.41 mph (150.34 km/h) |
| 100 mph (160.93 km/h) | 98.33 mph (158.25 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
