Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/55-20 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.64 (854.5) | 32.34 (821.5) | -1.3 (-33) -3.9% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 105.69 (2684.49) | 101.61 (2580.82) | -4.08 (-103.67) -3.9% |
| Sidewall Height inches (mm) | 6.82 (173.25) | 6.17 (156.75) | -0.65 (-16.5) -9.5% |
| Revolutions per mile (km) | 599.5 (372.51) | 623.58 (387.47) | 24.08 (14.96) 4% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.23 mph (30.94 km/h) |
| 25 mph (40.23 km/h) | 24.03 mph (38.68 km/h) |
| 30 mph (48.28 km/h) | 28.84 mph (46.42 km/h) |
| 35 mph (56.33 km/h) | 33.65 mph (54.15 km/h) |
| 40 mph (64.37 km/h) | 38.46 mph (61.89 km/h) |
| 45 mph (72.42 km/h) | 43.26 mph (69.62 km/h) |
| 50 mph (80.47 km/h) | 48.07 mph (77.36 km/h) |
| 55 mph (88.51 km/h) | 52.88 mph (85.1 km/h) |
| 60 mph (96.56 km/h) | 57.68 mph (92.83 km/h) |
| 65 mph (104.61 km/h) | 62.49 mph (100.57 km/h) |
| 70 mph (112.65 km/h) | 67.3 mph (108.3 km/h) |
| 75 mph (120.7 km/h) | 72.1 mph (116.04 km/h) |
| 80 mph (128.75 km/h) | 76.91 mph (123.78 km/h) |
| 85 mph (136.79 km/h) | 81.72 mph (131.51 km/h) |
| 90 mph (144.84 km/h) | 86.52 mph (139.25 km/h) |
| 95 mph (152.89 km/h) | 91.33 mph (146.98 km/h) |
| 100 mph (160.93 km/h) | 96.14 mph (154.72 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1587 | 1843 | 1985 | 2073 | 2168 | 2235 | 2309 | 2397 | 2519 | 2640 | 2775 | 2883 | 3079 | 3295 | 3464 | 3572 | 3633 | 3856 | 4166 | 4842 |
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