Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/70-20 | 305/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.09 (739) | 34.81 (884.2) | 5.72 (145.2) 19.6% |
| Width inches (mm) | 6.5 (165) | 12.01 (305) | 5.51 (140) 84.8% |
| Circum. inches (mm) | 91.4 (2321.64) | 109.36 (2777.8) | 17.96 (456.16) 19.6% |
| Sidewall Height inches (mm) | 4.55 (115.5) | 8.41 (213.5) | 3.86 (98) 84.8% |
| Revolutions per mile (km) | 693.19 (430.73) | 579.36 (360) | -113.83 (-70.73) -16.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.93 mph (38.51 km/h) |
| 25 mph (40.23 km/h) | 29.91 mph (48.14 km/h) |
| 30 mph (48.28 km/h) | 35.89 mph (57.77 km/h) |
| 35 mph (56.33 km/h) | 41.88 mph (67.39 km/h) |
| 40 mph (64.37 km/h) | 47.86 mph (77.02 km/h) |
| 45 mph (72.42 km/h) | 53.84 mph (86.65 km/h) |
| 50 mph (80.47 km/h) | 59.82 mph (96.28 km/h) |
| 55 mph (88.51 km/h) | 65.81 mph (105.91 km/h) |
| 60 mph (96.56 km/h) | 71.79 mph (115.53 km/h) |
| 65 mph (104.61 km/h) | 77.77 mph (125.16 km/h) |
| 70 mph (112.65 km/h) | 83.75 mph (134.79 km/h) |
| 75 mph (120.7 km/h) | 89.74 mph (144.42 km/h) |
| 80 mph (128.75 km/h) | 95.72 mph (154.04 km/h) |
| 85 mph (136.79 km/h) | 101.7 mph (163.67 km/h) |
| 90 mph (144.84 km/h) | 107.68 mph (173.3 km/h) |
| 95 mph (152.89 km/h) | 113.67 mph (182.93 km/h) |
| 100 mph (160.93 km/h) | 119.65 mph (192.56 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1474 | 1713 | 1845 | 1926 | 2014 | 2077 | 2146 | 2227 | 2340 | 2453 | 2579 | 2679 | 2861 | 3062 | 3218 | 3319 | 3375 | 3582 | 3871 | 4498 |
Better Fuel Economy Factory Ratios Increased Power
