Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/55-15 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.88 (606.5) | 33.21 (843.5) | 9.33 (237) 39.1% |
| Width inches (mm) | 8.07 (205) | 12.01 (305) | 3.94 (100) 48.8% |
| Circum. inches (mm) | 75.01 (1905.38) | 104.33 (2649.93) | 29.31 (744.56) 39.1% |
| Sidewall Height inches (mm) | 4.44 (112.75) | 6.6 (167.75) | 2.17 (55) 48.8% |
| Revolutions per mile (km) | 844.63 (524.83) | 607.31 (377.37) | -237.32 (-147.46) -28.1% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.82 mph (44.76 km/h) |
| 25 mph (40.23 km/h) | 34.77 mph (55.96 km/h) |
| 30 mph (48.28 km/h) | 41.72 mph (67.15 km/h) |
| 35 mph (56.33 km/h) | 48.68 mph (78.34 km/h) |
| 40 mph (64.37 km/h) | 55.63 mph (89.53 km/h) |
| 45 mph (72.42 km/h) | 62.58 mph (100.72 km/h) |
| 50 mph (80.47 km/h) | 69.54 mph (111.91 km/h) |
| 55 mph (88.51 km/h) | 76.49 mph (123.1 km/h) |
| 60 mph (96.56 km/h) | 83.45 mph (134.29 km/h) |
| 65 mph (104.61 km/h) | 90.4 mph (145.48 km/h) |
| 70 mph (112.65 km/h) | 97.35 mph (156.68 km/h) |
| 75 mph (120.7 km/h) | 104.31 mph (167.87 km/h) |
| 80 mph (128.75 km/h) | 111.26 mph (179.06 km/h) |
| 85 mph (136.79 km/h) | 118.22 mph (190.25 km/h) |
| 90 mph (144.84 km/h) | 125.17 mph (201.44 km/h) |
| 95 mph (152.89 km/h) | 132.12 mph (212.63 km/h) |
| 100 mph (160.93 km/h) | 139.08 mph (223.82 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
