Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.41 (874) | 33.21 (843.5) | -1.2 (-30.5) -3.5% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 108.1 (2745.75) | 104.33 (2649.93) | -3.77 (-95.82) -3.5% |
| Sidewall Height inches (mm) | 7.2 (183) | 6.6 (167.75) | -0.6 (-15.25) -8.3% |
| Revolutions per mile (km) | 586.12 (364.2) | 607.31 (377.37) | 21.19 (13.17) 3.6% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.3 mph (31.06 km/h) |
| 25 mph (40.23 km/h) | 24.13 mph (38.83 km/h) |
| 30 mph (48.28 km/h) | 28.95 mph (46.6 km/h) |
| 35 mph (56.33 km/h) | 33.78 mph (54.36 km/h) |
| 40 mph (64.37 km/h) | 38.6 mph (62.13 km/h) |
| 45 mph (72.42 km/h) | 43.43 mph (69.89 km/h) |
| 50 mph (80.47 km/h) | 48.26 mph (77.66 km/h) |
| 55 mph (88.51 km/h) | 53.08 mph (85.43 km/h) |
| 60 mph (96.56 km/h) | 57.91 mph (93.19 km/h) |
| 65 mph (104.61 km/h) | 62.73 mph (100.96 km/h) |
| 70 mph (112.65 km/h) | 67.56 mph (108.72 km/h) |
| 75 mph (120.7 km/h) | 72.38 mph (116.49 km/h) |
| 80 mph (128.75 km/h) | 77.21 mph (124.25 km/h) |
| 85 mph (136.79 km/h) | 82.03 mph (132.02 km/h) |
| 90 mph (144.84 km/h) | 86.86 mph (139.79 km/h) |
| 95 mph (152.89 km/h) | 91.68 mph (147.55 km/h) |
| 100 mph (160.93 km/h) | 96.51 mph (155.32 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
