Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/70-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.95 (710) | 30.98 (786.84) | 3.03 (76.84) 10.8% |
| Width inches (mm) | 9.25 (235) | 10.51 (267) | 1.26 (32) 13.6% |
| Circum. inches (mm) | 87.82 (2230.53) | 97.32 (2471.93) | 9.5 (241.4) 10.8% |
| Sidewall Height inches (mm) | 6.48 (164.5) | 7.99 (202.92) | 1.51 (38.42) 23.4% |
| Revolutions per mile (km) | 721.51 (448.32) | 651.05 (404.54) | -70.46 (-43.78) -9.8% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.16 mph (35.67 km/h) |
| 25 mph (40.23 km/h) | 27.71 mph (44.59 km/h) |
| 30 mph (48.28 km/h) | 33.25 mph (53.51 km/h) |
| 35 mph (56.33 km/h) | 38.79 mph (62.42 km/h) |
| 40 mph (64.37 km/h) | 44.33 mph (71.34 km/h) |
| 45 mph (72.42 km/h) | 49.87 mph (80.26 km/h) |
| 50 mph (80.47 km/h) | 55.41 mph (89.18 km/h) |
| 55 mph (88.51 km/h) | 60.95 mph (98.09 km/h) |
| 60 mph (96.56 km/h) | 66.49 mph (107.01 km/h) |
| 65 mph (104.61 km/h) | 72.03 mph (115.93 km/h) |
| 70 mph (112.65 km/h) | 77.58 mph (124.85 km/h) |
| 75 mph (120.7 km/h) | 83.12 mph (133.76 km/h) |
| 80 mph (128.75 km/h) | 88.66 mph (142.68 km/h) |
| 85 mph (136.79 km/h) | 94.2 mph (151.6 km/h) |
| 90 mph (144.84 km/h) | 99.74 mph (160.52 km/h) |
| 95 mph (152.89 km/h) | 105.28 mph (169.43 km/h) |
| 100 mph (160.93 km/h) | 110.82 mph (178.35 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
