Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-21 | 275/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.91 (835.9) | 35.16 (893) | 2.25 (57.1) 6.8% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 103.39 (2626.06) | 110.45 (2805.44) | 7.06 (179.38) 6.8% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 7.58 (192.5) | 1.62 (41.25) 27.3% |
| Revolutions per mile (km) | 612.84 (380.8) | 573.65 (356.45) | -39.19 (-24.35) -6.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.37 mph (34.39 km/h) |
| 25 mph (40.23 km/h) | 26.71 mph (42.98 km/h) |
| 30 mph (48.28 km/h) | 32.05 mph (51.58 km/h) |
| 35 mph (56.33 km/h) | 37.39 mph (60.17 km/h) |
| 40 mph (64.37 km/h) | 42.73 mph (68.77 km/h) |
| 45 mph (72.42 km/h) | 48.07 mph (77.37 km/h) |
| 50 mph (80.47 km/h) | 53.42 mph (85.96 km/h) |
| 55 mph (88.51 km/h) | 58.76 mph (94.56 km/h) |
| 60 mph (96.56 km/h) | 64.1 mph (103.16 km/h) |
| 65 mph (104.61 km/h) | 69.44 mph (111.75 km/h) |
| 70 mph (112.65 km/h) | 74.78 mph (120.35 km/h) |
| 75 mph (120.7 km/h) | 80.12 mph (128.95 km/h) |
| 80 mph (128.75 km/h) | 85.46 mph (137.54 km/h) |
| 85 mph (136.79 km/h) | 90.81 mph (146.14 km/h) |
| 90 mph (144.84 km/h) | 96.15 mph (154.74 km/h) |
| 95 mph (152.89 km/h) | 101.49 mph (163.33 km/h) |
| 100 mph (160.93 km/h) | 106.83 mph (171.93 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1460 | 1696 | 1826 | 1907 | 1994 | 2056 | 2125 | 2205 | 2317 | 2429 | 2553 | 2653 | 2833 | 3031 | 3187 | 3286 | 3342 | 3547 | 3833 | 4454 |
Better Fuel Economy Factory Ratios Increased Power
