| 摘要 |
The bicycle gear mechanism, in particular a rear wheel change mechanism, comprises a derailleur provided with a drive chain guide element. The derailleur comprises: an arm ( 2 ); a first attachment element ( 5 ), rotatingly constrained to the arm ( 2 ) by a first shaft ( 3 ), the first attachment element ( 5 ) being predisposed to connect the arm ( 2 ) to the bicycle frame; a second attachment element ( 6 ), rotatably constrained to the arm ( 2 ), the second attachment element ( 6 ) being predisposed to connect the arm ( 2 ) to an element ( 7 ) predisposed to guide the drive chain ( 30 ) of the bicycle; a mechanism predisposed to rotatingly connect the first shaft ( 3 ) and the second shaft ( 4 ); at least an actuator, operatively connected to the arm ( 2 ) and the bicycle frame, which actuator is predisposed to rotate the arm ( 2 ) about the first shaft ( 3 ).
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