Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/65-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.07 (865.5) | 33.21 (843.5) | -0.87 (-22) -2.5% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 107.05 (2719.05) | 104.33 (2649.93) | -2.72 (-69.12) -2.5% |
| Sidewall Height inches (mm) | 7.04 (178.75) | 6.6 (167.75) | -0.43 (-11) -6.2% |
| Revolutions per mile (km) | 591.88 (367.78) | 607.31 (377.37) | 15.44 (9.59) 2.6% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.49 mph (31.37 km/h) |
| 25 mph (40.23 km/h) | 24.36 mph (39.21 km/h) |
| 30 mph (48.28 km/h) | 29.24 mph (47.05 km/h) |
| 35 mph (56.33 km/h) | 34.11 mph (54.9 km/h) |
| 40 mph (64.37 km/h) | 38.98 mph (62.74 km/h) |
| 45 mph (72.42 km/h) | 43.86 mph (70.58 km/h) |
| 50 mph (80.47 km/h) | 48.73 mph (78.42 km/h) |
| 55 mph (88.51 km/h) | 53.6 mph (86.26 km/h) |
| 60 mph (96.56 km/h) | 58.47 mph (94.11 km/h) |
| 65 mph (104.61 km/h) | 63.35 mph (101.95 km/h) |
| 70 mph (112.65 km/h) | 68.22 mph (109.79 km/h) |
| 75 mph (120.7 km/h) | 73.09 mph (117.63 km/h) |
| 80 mph (128.75 km/h) | 77.97 mph (125.48 km/h) |
| 85 mph (136.79 km/h) | 82.84 mph (133.32 km/h) |
| 90 mph (144.84 km/h) | 87.71 mph (141.16 km/h) |
| 95 mph (152.89 km/h) | 92.59 mph (149 km/h) |
| 100 mph (160.93 km/h) | 97.46 mph (156.84 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
