Sram Corporation

Sram Deutschland Gmbh

Joachim Stuermer

Henrik Braedt

Martin Weiss

Alexander Linke

Sebastian Dueweling

En-Chieh Chen

Tobias Harcke

Matthias Mueller

Hong-Chou Lee

Chen-Hsiung Chen

Florian Fuhlrott

A bicycle crank may include a first lug, a second lug and a transition region. The first lug is for connecting a spindle. The second lug is for connecting a pedal. The transition region interconnects the first lug and the second lug, and is formed from a fiber reinforced thermoplastic material that includes a fiber component and a thermoplastic component.

Bicycle crank arm

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

Joachim Stuermer