Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 305/50-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 29.01 (736.8) | -1.8 (-45.7) -5.8% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 96.78 (2458.3) | 91.13 (2314.73) | -5.65 (-143.57) -5.8% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 6 (152.5) | 0.6 (15.25) 11.1% |
| Revolutions per mile (km) | 654.66 (406.79) | 695.26 (432.02) | 40.61 (25.23) 6.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.83 mph (30.31 km/h) |
| 25 mph (40.23 km/h) | 23.54 mph (37.88 km/h) |
| 30 mph (48.28 km/h) | 28.25 mph (45.46 km/h) |
| 35 mph (56.33 km/h) | 32.96 mph (53.04 km/h) |
| 40 mph (64.37 km/h) | 37.66 mph (60.61 km/h) |
| 45 mph (72.42 km/h) | 42.37 mph (68.19 km/h) |
| 50 mph (80.47 km/h) | 47.08 mph (75.77 km/h) |
| 55 mph (88.51 km/h) | 51.79 mph (83.34 km/h) |
| 60 mph (96.56 km/h) | 56.5 mph (90.92 km/h) |
| 65 mph (104.61 km/h) | 61.2 mph (98.5 km/h) |
| 70 mph (112.65 km/h) | 65.91 mph (106.07 km/h) |
| 75 mph (120.7 km/h) | 70.62 mph (113.65 km/h) |
| 80 mph (128.75 km/h) | 75.33 mph (121.23 km/h) |
| 85 mph (136.79 km/h) | 80.04 mph (128.81 km/h) |
| 90 mph (144.84 km/h) | 84.74 mph (136.38 km/h) |
| 95 mph (152.89 km/h) | 89.45 mph (143.96 km/h) |
| 100 mph (160.93 km/h) | 94.16 mph (151.54 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1769 | 2055 | 2214 | 2311 | 2417 | 2492 | 2575 | 2673 | 2808 | 2944 | 3094 | 3215 | 3433 | 3674 | 3862 | 3983 | 4051 | 4299 | 4645 | 5398 |
Better Fuel Economy Factory Ratios Increased Power
