Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 425/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 43.43 (1103) | 10.82 (274.8) 33.2% |
| Width inches (mm) | 12.01 (305) | 16.73 (425) | 4.72 (120) 39.3% |
| Circum. inches (mm) | 102.44 (2601.87) | 136.42 (3465.18) | 33.99 (863.31) 33.2% |
| Sidewall Height inches (mm) | 4.8 (122) | 11.71 (297.5) | 6.91 (175.5) 143.9% |
| Revolutions per mile (km) | 618.53 (384.34) | 464.43 (288.59) | -154.1 (-95.75) -24.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.64 mph (42.87 km/h) |
| 25 mph (40.23 km/h) | 33.3 mph (53.58 km/h) |
| 30 mph (48.28 km/h) | 39.95 mph (64.3 km/h) |
| 35 mph (56.33 km/h) | 46.61 mph (75.02 km/h) |
| 40 mph (64.37 km/h) | 53.27 mph (85.73 km/h) |
| 45 mph (72.42 km/h) | 59.93 mph (96.45 km/h) |
| 50 mph (80.47 km/h) | 66.59 mph (107.17 km/h) |
| 55 mph (88.51 km/h) | 73.25 mph (117.88 km/h) |
| 60 mph (96.56 km/h) | 79.91 mph (128.6 km/h) |
| 65 mph (104.61 km/h) | 86.57 mph (139.32 km/h) |
| 70 mph (112.65 km/h) | 93.23 mph (150.03 km/h) |
| 75 mph (120.7 km/h) | 99.89 mph (160.75 km/h) |
| 80 mph (128.75 km/h) | 106.54 mph (171.47 km/h) |
| 85 mph (136.79 km/h) | 113.2 mph (182.18 km/h) |
| 90 mph (144.84 km/h) | 119.86 mph (192.9 km/h) |
| 95 mph (152.89 km/h) | 126.52 mph (203.62 km/h) |
| 100 mph (160.93 km/h) | 133.18 mph (214.33 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1182 | 1373 | 1479 | 1544 | 1614 | 1665 | 1720 | 1785 | 1876 | 1966 | 2067 | 2148 | 2293 | 2454 | 2580 | 2661 | 2706 | 2872 | 3103 | 3606 |
Better Fuel Economy Factory Ratios Increased Power
