Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 275/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 31.91 (810.5) | -6.08 (-154.54) -16% |
| Width inches (mm) | 15.51 (394) | 10.83 (275) | -4.69 (-119) -30.2% |
| Circum. inches (mm) | 119.36 (3031.76) | 100.25 (2546.26) | -19.11 (-485.5) -16% |
| Sidewall Height inches (mm) | 9 (228.52) | 5.95 (151.25) | -3.04 (-77.27) -33.8% |
| Revolutions per mile (km) | 530.83 (329.84) | 632.04 (392.73) | 101.21 (62.89) 19.1% |
275/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.8 mph (27.03 km/h) |
| 25 mph (40.23 km/h) | 21 mph (33.79 km/h) |
| 30 mph (48.28 km/h) | 25.2 mph (40.55 km/h) |
| 35 mph (56.33 km/h) | 29.4 mph (47.31 km/h) |
| 40 mph (64.37 km/h) | 33.59 mph (54.07 km/h) |
| 45 mph (72.42 km/h) | 37.79 mph (60.82 km/h) |
| 50 mph (80.47 km/h) | 41.99 mph (67.58 km/h) |
| 55 mph (88.51 km/h) | 46.19 mph (74.34 km/h) |
| 60 mph (96.56 km/h) | 50.39 mph (81.1 km/h) |
| 65 mph (104.61 km/h) | 54.59 mph (87.86 km/h) |
| 70 mph (112.65 km/h) | 58.79 mph (94.61 km/h) |
| 75 mph (120.7 km/h) | 62.99 mph (101.37 km/h) |
| 80 mph (128.75 km/h) | 67.19 mph (108.13 km/h) |
| 85 mph (136.79 km/h) | 71.39 mph (114.89 km/h) |
| 90 mph (144.84 km/h) | 75.59 mph (121.65 km/h) |
| 95 mph (152.89 km/h) | 79.79 mph (128.4 km/h) |
| 100 mph (160.93 km/h) | 83.99 mph (135.16 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1608 | 1869 | 2012 | 2101 | 2197 | 2265 | 2341 | 2430 | 2553 | 2676 | 2813 | 2923 | 3121 | 3340 | 3511 | 3621 | 3682 | 3908 | 4223 | 4907 |
Better Fuel Economy Factory Ratios Increased Power
