Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/65-14 | 31/15.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25 (635.1) | 31.13 (790.76) | 6.13 (155.66) 24.5% |
| Width inches (mm) | 8.46 (215) | 15.51 (394) | 7.05 (179) 83.3% |
| Circum. inches (mm) | 78.55 (1995.23) | 97.8 (2484.25) | 19.25 (489.02) 24.5% |
| Sidewall Height inches (mm) | 5.5 (139.75) | 8.07 (204.88) | 2.56 (65.13) 46.6% |
| Revolutions per mile (km) | 806.6 (501.2) | 647.82 (402.54) | -158.78 (-98.66) -19.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.9 mph (40.08 km/h) |
| 25 mph (40.23 km/h) | 31.13 mph (50.09 km/h) |
| 30 mph (48.28 km/h) | 37.35 mph (60.11 km/h) |
| 35 mph (56.33 km/h) | 43.58 mph (70.13 km/h) |
| 40 mph (64.37 km/h) | 49.8 mph (80.15 km/h) |
| 45 mph (72.42 km/h) | 56.03 mph (90.17 km/h) |
| 50 mph (80.47 km/h) | 62.25 mph (100.19 km/h) |
| 55 mph (88.51 km/h) | 68.48 mph (110.21 km/h) |
| 60 mph (96.56 km/h) | 74.71 mph (120.23 km/h) |
| 65 mph (104.61 km/h) | 80.93 mph (130.25 km/h) |
| 70 mph (112.65 km/h) | 87.16 mph (140.27 km/h) |
| 75 mph (120.7 km/h) | 93.38 mph (150.28 km/h) |
| 80 mph (128.75 km/h) | 99.61 mph (160.3 km/h) |
| 85 mph (136.79 km/h) | 105.83 mph (170.32 km/h) |
| 90 mph (144.84 km/h) | 112.06 mph (180.34 km/h) |
| 95 mph (152.89 km/h) | 118.28 mph (190.36 km/h) |
| 100 mph (160.93 km/h) | 124.51 mph (200.38 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1649 | 1915 | 2062 | 2154 | 2252 | 2322 | 2399 | 2490 | 2617 | 2743 | 2883 | 2996 | 3199 | 3423 | 3599 | 3711 | 3774 | 4006 | 4328 | 5030 |
Better Fuel Economy Factory Ratios Increased Power
