Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.35 (898) | 33.21 (843.5) | -2.15 (-54.5) -6.1% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 111.07 (2821.15) | 104.33 (2649.93) | -6.74 (-171.22) -6.1% |
| Sidewall Height inches (mm) | 7.68 (195) | 6.6 (167.75) | -1.07 (-27.25) -14% |
| Revolutions per mile (km) | 570.46 (354.46) | 607.31 (377.37) | 36.86 (22.9) 6.5% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.79 mph (30.23 km/h) |
| 25 mph (40.23 km/h) | 23.48 mph (37.79 km/h) |
| 30 mph (48.28 km/h) | 28.18 mph (45.35 km/h) |
| 35 mph (56.33 km/h) | 32.88 mph (52.91 km/h) |
| 40 mph (64.37 km/h) | 37.57 mph (60.47 km/h) |
| 45 mph (72.42 km/h) | 42.27 mph (68.03 km/h) |
| 50 mph (80.47 km/h) | 46.97 mph (75.58 km/h) |
| 55 mph (88.51 km/h) | 51.66 mph (83.14 km/h) |
| 60 mph (96.56 km/h) | 56.36 mph (90.7 km/h) |
| 65 mph (104.61 km/h) | 61.06 mph (98.26 km/h) |
| 70 mph (112.65 km/h) | 65.75 mph (105.82 km/h) |
| 75 mph (120.7 km/h) | 70.45 mph (113.38 km/h) |
| 80 mph (128.75 km/h) | 75.14 mph (120.93 km/h) |
| 85 mph (136.79 km/h) | 79.84 mph (128.49 km/h) |
| 90 mph (144.84 km/h) | 84.54 mph (136.05 km/h) |
| 95 mph (152.89 km/h) | 89.23 mph (143.61 km/h) |
| 100 mph (160.93 km/h) | 93.93 mph (151.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1546 | 1795 | 1934 | 2019 | 2111 | 2177 | 2249 | 2335 | 2453 | 2571 | 2703 | 2808 | 2999 | 3209 | 3374 | 3479 | 3538 | 3755 | 4058 | 4715 |
Better Fuel Economy Factory Ratios Increased Power
