Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 375/45-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 35.29 (896.3) | 4.48 (113.8) 14.5% |
| Width inches (mm) | 12.01 (305) | 14.76 (375) | 2.76 (70) 23% |
| Circum. inches (mm) | 96.78 (2458.3) | 110.86 (2815.81) | 14.08 (357.51) 14.5% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 6.64 (168.75) | 1.24 (31.5) 23% |
| Revolutions per mile (km) | 654.66 (406.79) | 571.54 (355.14) | -83.12 (-51.65) -12.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.91 mph (36.87 km/h) |
| 25 mph (40.23 km/h) | 28.64 mph (46.08 km/h) |
| 30 mph (48.28 km/h) | 34.36 mph (55.3 km/h) |
| 35 mph (56.33 km/h) | 40.09 mph (64.52 km/h) |
| 40 mph (64.37 km/h) | 45.82 mph (73.74 km/h) |
| 45 mph (72.42 km/h) | 51.54 mph (82.95 km/h) |
| 50 mph (80.47 km/h) | 57.27 mph (92.17 km/h) |
| 55 mph (88.51 km/h) | 63 mph (101.39 km/h) |
| 60 mph (96.56 km/h) | 68.73 mph (110.6 km/h) |
| 65 mph (104.61 km/h) | 74.45 mph (119.82 km/h) |
| 70 mph (112.65 km/h) | 80.18 mph (129.04 km/h) |
| 75 mph (120.7 km/h) | 85.91 mph (138.25 km/h) |
| 80 mph (128.75 km/h) | 91.63 mph (147.47 km/h) |
| 85 mph (136.79 km/h) | 97.36 mph (156.69 km/h) |
| 90 mph (144.84 km/h) | 103.09 mph (165.91 km/h) |
| 95 mph (152.89 km/h) | 108.82 mph (175.12 km/h) |
| 100 mph (160.93 km/h) | 114.54 mph (184.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1454 | 1690 | 1820 | 1900 | 1987 | 2049 | 2117 | 2197 | 2309 | 2420 | 2544 | 2643 | 2822 | 3020 | 3175 | 3274 | 3330 | 3534 | 3819 | 4438 |
Better Fuel Economy Factory Ratios Increased Power
