Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/70-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.06 (738) | 30.98 (786.84) | 1.92 (48.84) 6.6% |
| Width inches (mm) | 10.04 (255) | 10.51 (267) | 0.47 (12) 4.7% |
| Circum. inches (mm) | 91.28 (2318.5) | 97.32 (2471.93) | 6.04 (153.44) 6.6% |
| Sidewall Height inches (mm) | 7.03 (178.5) | 7.99 (202.92) | 0.96 (24.42) 13.7% |
| Revolutions per mile (km) | 694.13 (431.31) | 651.05 (404.54) | -43.09 (-26.77) -6.2% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.32 mph (34.32 km/h) |
| 25 mph (40.23 km/h) | 26.65 mph (42.9 km/h) |
| 30 mph (48.28 km/h) | 31.99 mph (51.48 km/h) |
| 35 mph (56.33 km/h) | 37.32 mph (60.05 km/h) |
| 40 mph (64.37 km/h) | 42.65 mph (68.63 km/h) |
| 45 mph (72.42 km/h) | 47.98 mph (77.21 km/h) |
| 50 mph (80.47 km/h) | 53.31 mph (85.79 km/h) |
| 55 mph (88.51 km/h) | 58.64 mph (94.37 km/h) |
| 60 mph (96.56 km/h) | 63.97 mph (102.95 km/h) |
| 65 mph (104.61 km/h) | 69.3 mph (111.53 km/h) |
| 70 mph (112.65 km/h) | 74.63 mph (120.11 km/h) |
| 75 mph (120.7 km/h) | 79.96 mph (128.69 km/h) |
| 80 mph (128.75 km/h) | 85.29 mph (137.27 km/h) |
| 85 mph (136.79 km/h) | 90.63 mph (145.85 km/h) |
| 90 mph (144.84 km/h) | 95.96 mph (154.43 km/h) |
| 95 mph (152.89 km/h) | 101.29 mph (163.01 km/h) |
| 100 mph (160.93 km/h) | 106.62 mph (171.59 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
