Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/55-20 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.21 (843.5) | 32.34 (821.5) | -0.87 (-22) -2.6% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 104.33 (2649.93) | 101.61 (2580.82) | -2.72 (-69.12) -2.6% |
| Sidewall Height inches (mm) | 6.6 (167.75) | 6.17 (156.75) | -0.43 (-11) -6.6% |
| Revolutions per mile (km) | 607.31 (377.37) | 623.58 (387.47) | 16.26 (10.11) 2.7% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.48 mph (31.35 km/h) |
| 25 mph (40.23 km/h) | 24.35 mph (39.18 km/h) |
| 30 mph (48.28 km/h) | 29.22 mph (47.02 km/h) |
| 35 mph (56.33 km/h) | 34.09 mph (54.86 km/h) |
| 40 mph (64.37 km/h) | 38.96 mph (62.69 km/h) |
| 45 mph (72.42 km/h) | 43.83 mph (70.53 km/h) |
| 50 mph (80.47 km/h) | 48.7 mph (78.37 km/h) |
| 55 mph (88.51 km/h) | 53.57 mph (86.21 km/h) |
| 60 mph (96.56 km/h) | 58.44 mph (94.04 km/h) |
| 65 mph (104.61 km/h) | 63.3 mph (101.88 km/h) |
| 70 mph (112.65 km/h) | 68.17 mph (109.72 km/h) |
| 75 mph (120.7 km/h) | 73.04 mph (117.55 km/h) |
| 80 mph (128.75 km/h) | 77.91 mph (125.39 km/h) |
| 85 mph (136.79 km/h) | 82.78 mph (133.23 km/h) |
| 90 mph (144.84 km/h) | 87.65 mph (141.06 km/h) |
| 95 mph (152.89 km/h) | 92.52 mph (148.9 km/h) |
| 100 mph (160.93 km/h) | 97.39 mph (156.74 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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