| 摘要 |
In a cassette style rear hub for bicycles it is known to have a single seal on the right hand side and multiple seals on the left hand side. These seals prevent the contamination on the wheel bearings by water, dirt or other contaminants. In this invention a secondary seal has been designed to fit on the right hand side of the cassette. This seal will reduce the infiltration of contaminants to the right hand side wheel bearings.
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