Bicycle hub provided with a seal member for preventing entrance of dust

A hub including a spindle, a tubular hub housing sleeved rotatably on said spindle, a tubular end piece sleeved fixedly on said spindle near an end of said hub housing, and a tubular seal member disposed between said hub housing and said end piece, wherein the improvement comprises:

• said hub housing having an end surface which is formed with an annular groove that is defined by a side wall and a bottom wall;
• said end piece having a tubular insert portion with an annular frictional outer surface, around which said side wall of said hub housing is disposed;
• and
• said seal member being disposed within said hub housing and including:
• an L-shaped cross-sectioned flexible outer ring having a circular tubular portion with an axial inner end, and an inward flange extending integrally, radially and inwardly from said axial inner end of said circular tubular portion and abutting against said bottom wall of said hub housing, and
• a generally truncated conical inner ring having a largest-diameter inner end that is formed integrally with an inner periphery of said inward flange of said outer ring, and a smallest-diameter outer end portion which is sleeved around and which is in tight engagement with said frictional outer surface of said end piece, said inner ring reducing gradually in inner diameter from said largest-diameter inner end to said smallest-diameter outer end portion, said smallest-diameter outer end portion having an inner diameter that is slightly smaller than outer diameter of said insert portion of said end piece when removed from said end piece.