Sram Deutschland Gmbh

Matthias Mueller

Henrik Braedt

Martin Weiss

Alexander Linke

Sebastian Dueweling

Tobias Harcke

Joachim Stuermer

Florian Fuhlrott

A rear derailleur is provided for the coaxial attachment on a portion of a bicycle frame rear tail while using an adapter that includes an adapter bolt and an adapter nut and has a dual-arm base element, a pivoting mechanism, a movable element and a chain guide assembly. The reference is distinguished by at least one engagement element which facilitates an indirect frictional engagement between the adapter nut, on the one hand, and at least one of a) an inner first arm of the base element, b) an axial internal side of the mounting portion and c) the adapter bolt, on the other hand. Said engagement element, in a defined pre-assembled state, acts in the sense of a reinforcement of a consequential rotational force being able to be exerted on the base element by the adapter bolt and the adapter nut.

Rear derailleur

A rear derailleur is configured as a hierarchical, at least two-level modular construction system and comprises at least several of the modules: “base element module”, “swivel formation module”, “shifting element module”, and “chain guiding device module”. At least one of the modules is replaceable and handleable in one piece. At least one of the modules includes at least one sub-assembly that is replaceable and handleable in one piece. In an embodiment the modular construction system is configured to use at least one family of sub-assemblies comprising at least two family members within at least one of the modules. Detachable connection interfaces of the family members to adjacent sub-assemblies of the module within the sub-assembly family are configured uniformly across family members for the respective sub-assembly family in such a way that a family member of the sub-assembly family of the module is exchangeable for another family member of the same sub-assembly family that, is for example, of different material, of different design, of different functionality or has different surface properties, while retaining the remaining sub-assemblies of the module.

Modular bicycle derailleur

Growing community of inventors

SCHWEINFURT, Germany

Matthias Mueller