Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/70-20 | 315/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.09 (739) | 41.08 (1043.5) | 11.99 (304.5) 41.2% |
| Width inches (mm) | 6.5 (165) | 12.4 (315) | 5.91 (150) 90.9% |
| Circum. inches (mm) | 91.4 (2321.64) | 129.07 (3278.25) | 37.66 (956.61) 41.2% |
| Sidewall Height inches (mm) | 4.55 (115.5) | 10.54 (267.75) | 5.99 (152.25) 131.8% |
| Revolutions per mile (km) | 693.19 (430.73) | 490.92 (305.04) | -202.28 (-125.69) -29.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 28.24 mph (45.45 km/h) |
| 25 mph (40.23 km/h) | 35.3 mph (56.81 km/h) |
| 30 mph (48.28 km/h) | 42.36 mph (68.17 km/h) |
| 35 mph (56.33 km/h) | 49.42 mph (79.54 km/h) |
| 40 mph (64.37 km/h) | 56.48 mph (90.9 km/h) |
| 45 mph (72.42 km/h) | 63.54 mph (102.26 km/h) |
| 50 mph (80.47 km/h) | 70.6 mph (113.62 km/h) |
| 55 mph (88.51 km/h) | 77.66 mph (124.99 km/h) |
| 60 mph (96.56 km/h) | 84.72 mph (136.35 km/h) |
| 65 mph (104.61 km/h) | 91.78 mph (147.71 km/h) |
| 70 mph (112.65 km/h) | 98.84 mph (159.07 km/h) |
| 75 mph (120.7 km/h) | 105.9 mph (170.44 km/h) |
| 80 mph (128.75 km/h) | 112.96 mph (181.8 km/h) |
| 85 mph (136.79 km/h) | 120.02 mph (193.16 km/h) |
| 90 mph (144.84 km/h) | 127.08 mph (204.52 km/h) |
| 95 mph (152.89 km/h) | 134.14 mph (215.88 km/h) |
| 100 mph (160.93 km/h) | 141.2 mph (227.25 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1249 | 1451 | 1563 | 1632 | 1706 | 1760 | 1818 | 1887 | 1983 | 2079 | 2185 | 2270 | 2424 | 2594 | 2727 | 2812 | 2860 | 3035 | 3280 | 3812 |
Better Fuel Economy Factory Ratios Increased Power
