Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/80-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.54 (725) | 30.98 (786.84) | 2.43 (61.84) 8.5% |
| Width inches (mm) | 8.46 (215) | 10.51 (267) | 2.05 (52) 24.2% |
| Circum. inches (mm) | 89.67 (2277.65) | 97.32 (2471.93) | 7.65 (194.28) 8.5% |
| Sidewall Height inches (mm) | 6.77 (172) | 7.99 (202.92) | 1.22 (30.92) 18% |
| Revolutions per mile (km) | 706.58 (439.05) | 651.05 (404.54) | -55.53 (-34.51) -7.9% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.71 mph (34.93 km/h) |
| 25 mph (40.23 km/h) | 27.13 mph (43.67 km/h) |
| 30 mph (48.28 km/h) | 32.56 mph (52.4 km/h) |
| 35 mph (56.33 km/h) | 37.99 mph (61.13 km/h) |
| 40 mph (64.37 km/h) | 43.41 mph (69.86 km/h) |
| 45 mph (72.42 km/h) | 48.84 mph (78.6 km/h) |
| 50 mph (80.47 km/h) | 54.26 mph (87.33 km/h) |
| 55 mph (88.51 km/h) | 59.69 mph (96.06 km/h) |
| 60 mph (96.56 km/h) | 65.12 mph (104.8 km/h) |
| 65 mph (104.61 km/h) | 70.54 mph (113.53 km/h) |
| 70 mph (112.65 km/h) | 75.97 mph (122.26 km/h) |
| 75 mph (120.7 km/h) | 81.4 mph (131 km/h) |
| 80 mph (128.75 km/h) | 86.82 mph (139.73 km/h) |
| 85 mph (136.79 km/h) | 92.25 mph (148.46 km/h) |
| 90 mph (144.84 km/h) | 97.68 mph (157.2 km/h) |
| 95 mph (152.89 km/h) | 103.1 mph (165.93 km/h) |
| 100 mph (160.93 km/h) | 108.53 mph (174.66 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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