The invention relates to a chains launcher assembly consisting of the light materials for a bicycle circuit, in particular the positive connection of a supporting component made of metal, for example, steel with a plate-shaped side part of a chain guide from aluminum or fiber composite material by means of a thermoplastic connecting piece to a stable three - components - component. The connecting part, between the supporting component and the lateral member comprises a positive connection bow. In addition, the connecting part is equipped with gasket edges, one of the lateral sealing of the adjacent components such as the chains guidance receptacle or of the guide roller against dirt ensures.
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