Chain guide roller for a rear derailleur of a derailleur gear of a bicycle and rear derailleur with such a chain guide roller

摘要

The roller (28) has annular roller body (50) with a central aperture (52) for rotatable bearing around a rotational axis (Z) of the roller. A gearing unit (54) includes radial protruding teeth (56) to be arranged at external periphery of the body, and a tooth gap (60) is formed between the teeth along circumferential direction. The individual teeth comprise a predetermined tooth width, and a guiding section (66) is located at a part of the gap in a region close to a tooth gap base (64) and/or part of the teeth and includes width greater than that of the gap at the teeth.