Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/70-17 | 275/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.71 (830.8) | 31.91 (810.5) | -0.8 (-20.3) -2.4% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 102.76 (2610.04) | 100.25 (2546.26) | -2.51 (-63.77) -2.4% |
| Sidewall Height inches (mm) | 7.85 (199.5) | 5.95 (151.25) | -1.9 (-48.25) -24.2% |
| Revolutions per mile (km) | 616.6 (383.14) | 632.04 (392.73) | 15.44 (9.6) 2.5% |
275/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.51 mph (31.4 km/h) |
| 25 mph (40.23 km/h) | 24.39 mph (39.25 km/h) |
| 30 mph (48.28 km/h) | 29.27 mph (47.1 km/h) |
| 35 mph (56.33 km/h) | 34.14 mph (54.95 km/h) |
| 40 mph (64.37 km/h) | 39.02 mph (62.8 km/h) |
| 45 mph (72.42 km/h) | 43.9 mph (70.65 km/h) |
| 50 mph (80.47 km/h) | 48.78 mph (78.5 km/h) |
| 55 mph (88.51 km/h) | 53.66 mph (86.35 km/h) |
| 60 mph (96.56 km/h) | 58.53 mph (94.2 km/h) |
| 65 mph (104.61 km/h) | 63.41 mph (102.05 km/h) |
| 70 mph (112.65 km/h) | 68.29 mph (109.9 km/h) |
| 75 mph (120.7 km/h) | 73.17 mph (117.75 km/h) |
| 80 mph (128.75 km/h) | 78.05 mph (125.6 km/h) |
| 85 mph (136.79 km/h) | 82.92 mph (133.45 km/h) |
| 90 mph (144.84 km/h) | 87.8 mph (141.3 km/h) |
| 95 mph (152.89 km/h) | 92.68 mph (149.15 km/h) |
| 100 mph (160.93 km/h) | 97.56 mph (157 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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