Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 195/80-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.28 (693) | 30.98 (786.84) | 3.69 (93.84) 13.5% |
| Width inches (mm) | 7.68 (195) | 10.51 (267) | 2.83 (72) 36.9% |
| Circum. inches (mm) | 85.71 (2177.12) | 97.32 (2471.93) | 11.61 (294.81) 13.5% |
| Sidewall Height inches (mm) | 6.14 (156) | 7.99 (202.92) | 1.85 (46.92) 30.1% |
| Revolutions per mile (km) | 739.21 (459.32) | 651.05 (404.54) | -88.16 (-54.78) -11.9% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.71 mph (36.55 km/h) |
| 25 mph (40.23 km/h) | 28.39 mph (45.68 km/h) |
| 30 mph (48.28 km/h) | 34.06 mph (54.82 km/h) |
| 35 mph (56.33 km/h) | 39.74 mph (63.95 km/h) |
| 40 mph (64.37 km/h) | 45.42 mph (73.09 km/h) |
| 45 mph (72.42 km/h) | 51.09 mph (82.23 km/h) |
| 50 mph (80.47 km/h) | 56.77 mph (91.36 km/h) |
| 55 mph (88.51 km/h) | 62.45 mph (100.5 km/h) |
| 60 mph (96.56 km/h) | 68.12 mph (109.64 km/h) |
| 65 mph (104.61 km/h) | 73.8 mph (118.77 km/h) |
| 70 mph (112.65 km/h) | 79.48 mph (127.91 km/h) |
| 75 mph (120.7 km/h) | 85.16 mph (137.05 km/h) |
| 80 mph (128.75 km/h) | 90.83 mph (146.18 km/h) |
| 85 mph (136.79 km/h) | 96.51 mph (155.32 km/h) |
| 90 mph (144.84 km/h) | 102.19 mph (164.45 km/h) |
| 95 mph (152.89 km/h) | 107.86 mph (173.59 km/h) |
| 100 mph (160.93 km/h) | 113.54 mph (182.73 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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