Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/50-20 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.01 (813) | 32.34 (821.5) | 0.33 (8.5) 1% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 100.56 (2554.11) | 101.61 (2580.82) | 1.05 (26.7) 1% |
| Sidewall Height inches (mm) | 6 (152.5) | 6.17 (156.75) | 0.17 (4.25) 2.8% |
| Revolutions per mile (km) | 630.1 (391.52) | 623.58 (387.47) | -6.52 (-4.05) -1% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.21 mph (32.52 km/h) |
| 25 mph (40.23 km/h) | 25.26 mph (40.65 km/h) |
| 30 mph (48.28 km/h) | 30.31 mph (48.79 km/h) |
| 35 mph (56.33 km/h) | 35.37 mph (56.92 km/h) |
| 40 mph (64.37 km/h) | 40.42 mph (65.05 km/h) |
| 45 mph (72.42 km/h) | 45.47 mph (73.18 km/h) |
| 50 mph (80.47 km/h) | 50.52 mph (81.31 km/h) |
| 55 mph (88.51 km/h) | 55.58 mph (89.44 km/h) |
| 60 mph (96.56 km/h) | 60.63 mph (97.57 km/h) |
| 65 mph (104.61 km/h) | 65.68 mph (105.7 km/h) |
| 70 mph (112.65 km/h) | 70.73 mph (113.83 km/h) |
| 75 mph (120.7 km/h) | 75.78 mph (121.96 km/h) |
| 80 mph (128.75 km/h) | 80.84 mph (130.09 km/h) |
| 85 mph (136.79 km/h) | 85.89 mph (138.22 km/h) |
| 90 mph (144.84 km/h) | 90.94 mph (146.36 km/h) |
| 95 mph (152.89 km/h) | 95.99 mph (154.49 km/h) |
| 100 mph (160.93 km/h) | 101.05 mph (162.62 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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