Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/55-18 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.34 (770.7) | 32.34 (821.5) | 2 (50.8) 6.6% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 95.32 (2421.23) | 101.61 (2580.82) | 6.28 (159.59) 6.6% |
| Sidewall Height inches (mm) | 6.17 (156.75) | 6.17 (156.75) | 0 (0) 0% |
| Revolutions per mile (km) | 664.68 (413.01) | 623.58 (387.47) | -41.1 (-25.54) -6.2% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.32 mph (34.31 km/h) |
| 25 mph (40.23 km/h) | 26.65 mph (42.89 km/h) |
| 30 mph (48.28 km/h) | 31.98 mph (51.46 km/h) |
| 35 mph (56.33 km/h) | 37.31 mph (60.04 km/h) |
| 40 mph (64.37 km/h) | 42.64 mph (68.62 km/h) |
| 45 mph (72.42 km/h) | 47.97 mph (77.19 km/h) |
| 50 mph (80.47 km/h) | 53.3 mph (85.77 km/h) |
| 55 mph (88.51 km/h) | 58.63 mph (94.35 km/h) |
| 60 mph (96.56 km/h) | 63.95 mph (102.93 km/h) |
| 65 mph (104.61 km/h) | 69.28 mph (111.5 km/h) |
| 70 mph (112.65 km/h) | 74.61 mph (120.08 km/h) |
| 75 mph (120.7 km/h) | 79.94 mph (128.66 km/h) |
| 80 mph (128.75 km/h) | 85.27 mph (137.23 km/h) |
| 85 mph (136.79 km/h) | 90.6 mph (145.81 km/h) |
| 90 mph (144.84 km/h) | 95.93 mph (154.39 km/h) |
| 95 mph (152.89 km/h) | 101.26 mph (162.97 km/h) |
| 100 mph (160.93 km/h) | 106.59 mph (171.54 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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