Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/70-20 | 305/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.09 (739) | 36.81 (935) | 7.72 (196) 26.5% |
| Width inches (mm) | 6.5 (165) | 12.01 (305) | 5.51 (140) 84.8% |
| Circum. inches (mm) | 91.4 (2321.64) | 115.65 (2937.39) | 24.24 (615.75) 26.5% |
| 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) | 547.88 (340.44) | -145.31 (-90.29) -21% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.3 mph (40.72 km/h) |
| 25 mph (40.23 km/h) | 31.63 mph (50.9 km/h) |
| 30 mph (48.28 km/h) | 37.96 mph (61.09 km/h) |
| 35 mph (56.33 km/h) | 44.28 mph (71.27 km/h) |
| 40 mph (64.37 km/h) | 50.61 mph (81.45 km/h) |
| 45 mph (72.42 km/h) | 56.94 mph (91.63 km/h) |
| 50 mph (80.47 km/h) | 63.26 mph (101.81 km/h) |
| 55 mph (88.51 km/h) | 69.59 mph (111.99 km/h) |
| 60 mph (96.56 km/h) | 75.91 mph (122.17 km/h) |
| 65 mph (104.61 km/h) | 82.24 mph (132.35 km/h) |
| 70 mph (112.65 km/h) | 88.57 mph (142.53 km/h) |
| 75 mph (120.7 km/h) | 94.89 mph (152.71 km/h) |
| 80 mph (128.75 km/h) | 101.22 mph (162.89 km/h) |
| 85 mph (136.79 km/h) | 107.54 mph (173.08 km/h) |
| 90 mph (144.84 km/h) | 113.87 mph (183.26 km/h) |
| 95 mph (152.89 km/h) | 120.2 mph (193.44 km/h) |
| 100 mph (160.93 km/h) | 126.52 mph (203.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1394 | 1620 | 1744 | 1821 | 1904 | 1964 | 2029 | 2106 | 2213 | 2320 | 2438 | 2533 | 2705 | 2895 | 3044 | 3139 | 3192 | 3388 | 3661 | 4254 |
Better Fuel Economy Factory Ratios Increased Power
