Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/60-20 | 31/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.8 (706) | 31.02 (787.84) | 3.22 (81.84) 11.6% |
| Width inches (mm) | 6.5 (165) | 12.52 (318) | 6.02 (153) 92.7% |
| Circum. inches (mm) | 87.32 (2217.96) | 97.44 (2475.07) | 10.12 (257.11) 11.6% |
| Sidewall Height inches (mm) | 3.9 (99) | 5.51 (139.92) | 1.61 (40.92) 41.3% |
| Revolutions per mile (km) | 725.6 (450.86) | 650.22 (404.03) | -75.37 (-46.84) -10.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.32 mph (35.92 km/h) |
| 25 mph (40.23 km/h) | 27.9 mph (44.9 km/h) |
| 30 mph (48.28 km/h) | 33.48 mph (53.88 km/h) |
| 35 mph (56.33 km/h) | 39.06 mph (62.86 km/h) |
| 40 mph (64.37 km/h) | 44.64 mph (71.84 km/h) |
| 45 mph (72.42 km/h) | 50.22 mph (80.82 km/h) |
| 50 mph (80.47 km/h) | 55.8 mph (89.8 km/h) |
| 55 mph (88.51 km/h) | 61.38 mph (98.77 km/h) |
| 60 mph (96.56 km/h) | 66.96 mph (107.75 km/h) |
| 65 mph (104.61 km/h) | 72.53 mph (116.73 km/h) |
| 70 mph (112.65 km/h) | 78.11 mph (125.71 km/h) |
| 75 mph (120.7 km/h) | 83.69 mph (134.69 km/h) |
| 80 mph (128.75 km/h) | 89.27 mph (143.67 km/h) |
| 85 mph (136.79 km/h) | 94.85 mph (152.65 km/h) |
| 90 mph (144.84 km/h) | 100.43 mph (161.63 km/h) |
| 95 mph (152.89 km/h) | 106.01 mph (170.61 km/h) |
| 100 mph (160.93 km/h) | 111.59 mph (179.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1655 | 1922 | 2070 | 2162 | 2260 | 2331 | 2408 | 2500 | 2626 | 2753 | 2894 | 3007 | 3211 | 3436 | 3612 | 3725 | 3788 | 4021 | 4344 | 5049 |
Better Fuel Economy Factory Ratios Increased Power
