Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/80-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.17 (741) | 30.98 (786.84) | 1.8 (45.84) 6.2% |
| Width inches (mm) | 8.86 (225) | 10.51 (267) | 1.65 (42) 18.7% |
| Circum. inches (mm) | 91.65 (2327.92) | 97.32 (2471.93) | 5.67 (144.01) 6.2% |
| Sidewall Height inches (mm) | 7.09 (180) | 7.99 (202.92) | 0.9 (22.92) 12.7% |
| Revolutions per mile (km) | 691.32 (429.57) | 651.05 (404.54) | -40.28 (-25.03) -5.8% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.24 mph (34.18 km/h) |
| 25 mph (40.23 km/h) | 26.55 mph (42.72 km/h) |
| 30 mph (48.28 km/h) | 31.86 mph (51.27 km/h) |
| 35 mph (56.33 km/h) | 37.17 mph (59.81 km/h) |
| 40 mph (64.37 km/h) | 42.47 mph (68.36 km/h) |
| 45 mph (72.42 km/h) | 47.78 mph (76.9 km/h) |
| 50 mph (80.47 km/h) | 53.09 mph (85.45 km/h) |
| 55 mph (88.51 km/h) | 58.4 mph (93.99 km/h) |
| 60 mph (96.56 km/h) | 63.71 mph (102.53 km/h) |
| 65 mph (104.61 km/h) | 69.02 mph (111.08 km/h) |
| 70 mph (112.65 km/h) | 74.33 mph (119.62 km/h) |
| 75 mph (120.7 km/h) | 79.64 mph (128.17 km/h) |
| 80 mph (128.75 km/h) | 84.95 mph (136.71 km/h) |
| 85 mph (136.79 km/h) | 90.26 mph (145.26 km/h) |
| 90 mph (144.84 km/h) | 95.57 mph (153.8 km/h) |
| 95 mph (152.89 km/h) | 100.88 mph (162.35 km/h) |
| 100 mph (160.93 km/h) | 106.19 mph (170.89 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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