Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/65-17 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.07 (789.3) | 33.21 (843.5) | 2.13 (54.2) 6.9% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 97.62 (2479.66) | 104.33 (2649.93) | 6.7 (170.27) 6.9% |
| Sidewall Height inches (mm) | 7.04 (178.75) | 6.6 (167.75) | -0.43 (-11) -6.2% |
| Revolutions per mile (km) | 649.02 (403.28) | 607.31 (377.37) | -41.7 (-25.91) -6.4% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.37 mph (34.4 km/h) |
| 25 mph (40.23 km/h) | 26.72 mph (43 km/h) |
| 30 mph (48.28 km/h) | 32.06 mph (51.6 km/h) |
| 35 mph (56.33 km/h) | 37.4 mph (60.2 km/h) |
| 40 mph (64.37 km/h) | 42.75 mph (68.79 km/h) |
| 45 mph (72.42 km/h) | 48.09 mph (77.39 km/h) |
| 50 mph (80.47 km/h) | 53.43 mph (85.99 km/h) |
| 55 mph (88.51 km/h) | 58.78 mph (94.59 km/h) |
| 60 mph (96.56 km/h) | 64.12 mph (103.19 km/h) |
| 65 mph (104.61 km/h) | 69.46 mph (111.79 km/h) |
| 70 mph (112.65 km/h) | 74.81 mph (120.39 km/h) |
| 75 mph (120.7 km/h) | 80.15 mph (128.99 km/h) |
| 80 mph (128.75 km/h) | 85.49 mph (137.59 km/h) |
| 85 mph (136.79 km/h) | 90.84 mph (146.19 km/h) |
| 90 mph (144.84 km/h) | 96.18 mph (154.79 km/h) |
| 95 mph (152.89 km/h) | 101.52 mph (163.39 km/h) |
| 100 mph (160.93 km/h) | 106.87 mph (171.99 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
