Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 305/55-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 30.21 (767.3) | -0.6 (-15.2) -1.9% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 96.78 (2458.3) | 94.9 (2410.54) | -1.88 (-47.75) -1.9% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 6.6 (167.75) | 1.2 (30.5) 22.2% |
| Revolutions per mile (km) | 654.66 (406.79) | 667.63 (414.84) | 12.97 (8.06) 2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.61 mph (31.56 km/h) |
| 25 mph (40.23 km/h) | 24.51 mph (39.45 km/h) |
| 30 mph (48.28 km/h) | 29.42 mph (47.34 km/h) |
| 35 mph (56.33 km/h) | 34.32 mph (55.23 km/h) |
| 40 mph (64.37 km/h) | 39.22 mph (63.12 km/h) |
| 45 mph (72.42 km/h) | 44.13 mph (71.01 km/h) |
| 50 mph (80.47 km/h) | 49.03 mph (78.9 km/h) |
| 55 mph (88.51 km/h) | 53.93 mph (86.79 km/h) |
| 60 mph (96.56 km/h) | 58.83 mph (94.69 km/h) |
| 65 mph (104.61 km/h) | 63.74 mph (102.58 km/h) |
| 70 mph (112.65 km/h) | 68.64 mph (110.47 km/h) |
| 75 mph (120.7 km/h) | 73.54 mph (118.36 km/h) |
| 80 mph (128.75 km/h) | 78.45 mph (126.25 km/h) |
| 85 mph (136.79 km/h) | 83.35 mph (134.14 km/h) |
| 90 mph (144.84 km/h) | 88.25 mph (142.03 km/h) |
| 95 mph (152.89 km/h) | 93.15 mph (149.92 km/h) |
| 100 mph (160.93 km/h) | 98.06 mph (157.81 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1699 | 1974 | 2126 | 2220 | 2321 | 2393 | 2473 | 2567 | 2697 | 2827 | 2971 | 3087 | 3297 | 3528 | 3709 | 3825 | 3890 | 4128 | 4461 | 5184 |
Better Fuel Economy Factory Ratios Increased Power
