Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/70-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.85 (682) | 30.98 (786.84) | 4.13 (104.84) 15.4% |
| Width inches (mm) | 8.46 (215) | 10.51 (267) | 2.05 (52) 24.2% |
| Circum. inches (mm) | 84.35 (2142.57) | 97.32 (2471.93) | 12.97 (329.36) 15.4% |
| Sidewall Height inches (mm) | 5.93 (150.5) | 7.99 (202.92) | 2.06 (52.42) 34.8% |
| Revolutions per mile (km) | 751.13 (466.73) | 651.05 (404.54) | -100.08 (-62.19) -13.3% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.07 mph (37.13 km/h) |
| 25 mph (40.23 km/h) | 28.84 mph (46.42 km/h) |
| 30 mph (48.28 km/h) | 34.61 mph (55.7 km/h) |
| 35 mph (56.33 km/h) | 40.38 mph (64.99 km/h) |
| 40 mph (64.37 km/h) | 46.15 mph (74.27 km/h) |
| 45 mph (72.42 km/h) | 51.92 mph (83.55 km/h) |
| 50 mph (80.47 km/h) | 57.69 mph (92.84 km/h) |
| 55 mph (88.51 km/h) | 63.45 mph (102.12 km/h) |
| 60 mph (96.56 km/h) | 69.22 mph (111.4 km/h) |
| 65 mph (104.61 km/h) | 74.99 mph (120.69 km/h) |
| 70 mph (112.65 km/h) | 80.76 mph (129.97 km/h) |
| 75 mph (120.7 km/h) | 86.53 mph (139.26 km/h) |
| 80 mph (128.75 km/h) | 92.3 mph (148.54 km/h) |
| 85 mph (136.79 km/h) | 98.07 mph (157.82 km/h) |
| 90 mph (144.84 km/h) | 103.84 mph (167.11 km/h) |
| 95 mph (152.89 km/h) | 109.6 mph (176.39 km/h) |
| 100 mph (160.93 km/h) | 115.37 mph (185.67 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 |
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