Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 270/70-17 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.88 (809.8) | 30.98 (786.84) | -0.9 (-22.96) -2.8% |
| Width inches (mm) | 10.63 (270) | 10.51 (267) | -0.12 (-3) -1.1% |
| Circum. inches (mm) | 100.16 (2544.06) | 97.32 (2471.93) | -2.84 (-72.13) -2.8% |
| Sidewall Height inches (mm) | 7.44 (189) | 7.99 (202.92) | 0.55 (13.92) 7.4% |
| Revolutions per mile (km) | 632.59 (393.07) | 651.05 (404.54) | 18.46 (11.47) 2.9% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.43 mph (31.27 km/h) |
| 25 mph (40.23 km/h) | 24.29 mph (39.09 km/h) |
| 30 mph (48.28 km/h) | 29.15 mph (46.91 km/h) |
| 35 mph (56.33 km/h) | 34.01 mph (54.73 km/h) |
| 40 mph (64.37 km/h) | 38.87 mph (62.55 km/h) |
| 45 mph (72.42 km/h) | 43.72 mph (70.37 km/h) |
| 50 mph (80.47 km/h) | 48.58 mph (78.19 km/h) |
| 55 mph (88.51 km/h) | 53.44 mph (86 km/h) |
| 60 mph (96.56 km/h) | 58.3 mph (93.82 km/h) |
| 65 mph (104.61 km/h) | 63.16 mph (101.64 km/h) |
| 70 mph (112.65 km/h) | 68.02 mph (109.46 km/h) |
| 75 mph (120.7 km/h) | 72.87 mph (117.28 km/h) |
| 80 mph (128.75 km/h) | 77.73 mph (125.1 km/h) |
| 85 mph (136.79 km/h) | 82.59 mph (132.92 km/h) |
| 90 mph (144.84 km/h) | 87.45 mph (140.73 km/h) |
| 95 mph (152.89 km/h) | 92.31 mph (148.55 km/h) |
| 100 mph (160.93 km/h) | 97.16 mph (156.37 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
