Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-21 | 275/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.98 (761.4) | 31.91 (810.5) | 1.93 (49.1) 6.4% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 94.17 (2392.01) | 100.25 (2546.26) | 6.07 (154.25) 6.4% |
| Sidewall Height inches (mm) | 4.49 (114) | 5.95 (151.25) | 1.47 (37.25) 32.7% |
| Revolutions per mile (km) | 672.8 (418.06) | 632.04 (392.73) | -40.76 (-25.33) -6.1% |
275/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.29 mph (34.26 km/h) |
| 25 mph (40.23 km/h) | 26.61 mph (42.83 km/h) |
| 30 mph (48.28 km/h) | 31.93 mph (51.39 km/h) |
| 35 mph (56.33 km/h) | 37.26 mph (59.96 km/h) |
| 40 mph (64.37 km/h) | 42.58 mph (68.53 km/h) |
| 45 mph (72.42 km/h) | 47.9 mph (77.09 km/h) |
| 50 mph (80.47 km/h) | 53.22 mph (85.66 km/h) |
| 55 mph (88.51 km/h) | 58.55 mph (94.22 km/h) |
| 60 mph (96.56 km/h) | 63.87 mph (102.79 km/h) |
| 65 mph (104.61 km/h) | 69.19 mph (111.35 km/h) |
| 70 mph (112.65 km/h) | 74.51 mph (119.92 km/h) |
| 75 mph (120.7 km/h) | 79.84 mph (128.48 km/h) |
| 80 mph (128.75 km/h) | 85.16 mph (137.05 km/h) |
| 85 mph (136.79 km/h) | 90.48 mph (145.62 km/h) |
| 90 mph (144.84 km/h) | 95.8 mph (154.18 km/h) |
| 95 mph (152.89 km/h) | 101.13 mph (162.75 km/h) |
| 100 mph (160.93 km/h) | 106.45 mph (171.31 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 |
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