Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/60-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.99 (838) | 33.21 (843.5) | 0.22 (5.5) 0.7% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 103.65 (2632.65) | 104.33 (2649.93) | 0.68 (17.28) 0.7% |
| Sidewall Height inches (mm) | 6.5 (165) | 6.6 (167.75) | 0.11 (2.75) 1.7% |
| Revolutions per mile (km) | 611.3 (379.84) | 607.31 (377.37) | -3.99 (-2.48) -0.7% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.13 mph (32.4 km/h) |
| 25 mph (40.23 km/h) | 25.16 mph (40.5 km/h) |
| 30 mph (48.28 km/h) | 30.2 mph (48.6 km/h) |
| 35 mph (56.33 km/h) | 35.23 mph (56.7 km/h) |
| 40 mph (64.37 km/h) | 40.26 mph (64.8 km/h) |
| 45 mph (72.42 km/h) | 45.3 mph (72.9 km/h) |
| 50 mph (80.47 km/h) | 50.33 mph (81 km/h) |
| 55 mph (88.51 km/h) | 55.36 mph (89.1 km/h) |
| 60 mph (96.56 km/h) | 60.39 mph (97.19 km/h) |
| 65 mph (104.61 km/h) | 65.43 mph (105.29 km/h) |
| 70 mph (112.65 km/h) | 70.46 mph (113.39 km/h) |
| 75 mph (120.7 km/h) | 75.49 mph (121.49 km/h) |
| 80 mph (128.75 km/h) | 80.53 mph (129.59 km/h) |
| 85 mph (136.79 km/h) | 85.56 mph (137.69 km/h) |
| 90 mph (144.84 km/h) | 90.59 mph (145.79 km/h) |
| 95 mph (152.89 km/h) | 95.62 mph (153.89 km/h) |
| 100 mph (160.93 km/h) | 100.66 mph (161.99 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
