Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/55-20 | 285/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.34 (821.5) | 34.59 (878.5) | 2.24 (57) 6.9% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 101.61 (2580.82) | 108.66 (2759.89) | 7.05 (179.07) 6.9% |
| Sidewall Height inches (mm) | 6.17 (156.75) | 7.29 (185.25) | 1.12 (28.5) 18.2% |
| Revolutions per mile (km) | 623.58 (387.47) | 583.12 (362.33) | -40.46 (-25.14) -6.5% |
285/65-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.39 mph (34.42 km/h) |
| 25 mph (40.23 km/h) | 26.73 mph (43.03 km/h) |
| 30 mph (48.28 km/h) | 32.08 mph (51.63 km/h) |
| 35 mph (56.33 km/h) | 37.43 mph (60.24 km/h) |
| 40 mph (64.37 km/h) | 42.78 mph (68.84 km/h) |
| 45 mph (72.42 km/h) | 48.12 mph (77.45 km/h) |
| 50 mph (80.47 km/h) | 53.47 mph (86.05 km/h) |
| 55 mph (88.51 km/h) | 58.82 mph (94.66 km/h) |
| 60 mph (96.56 km/h) | 64.16 mph (103.26 km/h) |
| 65 mph (104.61 km/h) | 69.51 mph (111.87 km/h) |
| 70 mph (112.65 km/h) | 74.86 mph (120.47 km/h) |
| 75 mph (120.7 km/h) | 80.2 mph (129.08 km/h) |
| 80 mph (128.75 km/h) | 85.55 mph (137.68 km/h) |
| 85 mph (136.79 km/h) | 90.9 mph (146.29 km/h) |
| 90 mph (144.84 km/h) | 96.24 mph (154.89 km/h) |
| 95 mph (152.89 km/h) | 101.59 mph (163.5 km/h) |
| 100 mph (160.93 km/h) | 106.94 mph (172.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1484 | 1724 | 1856 | 1939 | 2027 | 2090 | 2160 | 2242 | 2355 | 2469 | 2595 | 2696 | 2879 | 3082 | 3239 | 3340 | 3397 | 3606 | 3896 | 4528 |
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