Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/65-15 | 31/10.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.05 (712.5) | 30.98 (786.84) | 2.93 (74.34) 10.4% |
| Width inches (mm) | 10.04 (255) | 10.51 (267) | 0.47 (12) 4.7% |
| Circum. inches (mm) | 88.13 (2238.38) | 97.32 (2471.93) | 9.19 (233.55) 10.4% |
| Sidewall Height inches (mm) | 6.53 (165.75) | 7.99 (202.92) | 1.46 (37.17) 22.4% |
| Revolutions per mile (km) | 718.98 (446.75) | 651.05 (404.54) | -67.93 (-42.21) -9.4% |
31/10.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.09 mph (35.55 km/h) |
| 25 mph (40.23 km/h) | 27.61 mph (44.43 km/h) |
| 30 mph (48.28 km/h) | 33.13 mph (53.32 km/h) |
| 35 mph (56.33 km/h) | 38.65 mph (62.2 km/h) |
| 40 mph (64.37 km/h) | 44.17 mph (71.09 km/h) |
| 45 mph (72.42 km/h) | 49.7 mph (79.98 km/h) |
| 50 mph (80.47 km/h) | 55.22 mph (88.86 km/h) |
| 55 mph (88.51 km/h) | 60.74 mph (97.75 km/h) |
| 60 mph (96.56 km/h) | 66.26 mph (106.64 km/h) |
| 65 mph (104.61 km/h) | 71.78 mph (115.52 km/h) |
| 70 mph (112.65 km/h) | 77.3 mph (124.41 km/h) |
| 75 mph (120.7 km/h) | 82.83 mph (133.29 km/h) |
| 80 mph (128.75 km/h) | 88.35 mph (142.18 km/h) |
| 85 mph (136.79 km/h) | 93.87 mph (151.07 km/h) |
| 90 mph (144.84 km/h) | 99.39 mph (159.95 km/h) |
| 95 mph (152.89 km/h) | 104.91 mph (168.84 km/h) |
| 100 mph (160.93 km/h) | 110.43 mph (177.73 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 |
Better Fuel Economy Factory Ratios Increased Power
