A bicycle sprocket assembly comprising:
- a first sprocket including:
- a first sprocket body;
- a plurality of first sprocket teeth disposed on an outer periphery of the first sprocket body, the plurality of first sprocket teeth defining a first maximum tooth-tip diameter;
- a first sprocket inward surface configured to face toward an axial center plane of a bicycle in a mounting state where the bicycle sprocket assembly is mounted to the bicycle;
- and
- a first sprocket outward surface provided on a reverse side of the first sprocket inward surface in an axial direction with respect to a rotational center axis of the bicycle sprocket, and
- a second sprocket adjacent to the first sprocket without another sprocket therebetween in the axial direction, the second sprocket including:
- a second sprocket body;
- a plurality of second sprocket teeth disposed on an outer periphery of the second sprocket body, the plurality of second sprocket teeth defining a second maximum tooth-tip diameter smaller than the first maximum tooth-tip diameter;
- a second sprocket inward surface configured to face toward the axial center plane of the bicycle in the mounting state;
- and
- a second sprocket outward surface provided on a reverse side of the second sprocket inward surface in the axial direction,
- the first sprocket including:
- an upshifting facilitation section configured to facilitate an upshifting operation where a bicycle chain shifts from the first sprocket toward the second sprocket;
- and
- an axial space defined between the first sprocket outward surface of one of the plurality of first sprocket teeth and an axially inward outer link plate of a pair of opposed outer link plates of the bicycle chain in the axial direction while the second sprocket outward surface of one of the plurality of second sprocket teeth contacts an axially outward inner link plate of a pair of opposed inner link plates of the bicycle chain in an engagement state where the one of the plurality of the second sprocket teeth is positioned between an axially inward inner link plate and the axially outward inner link plate of the pair of opposed inner link plates in the axial direction, the axially inward outer link plate and an axially outward outer link plate of the pair of opposed outer link plates being spaced apart from each other in the axial direction in an assembled state of the bicycle chain, the axially inward inner link plate and the axially outward inner link plate of the pair of opposed inner link plates being spaced apart from each other in the axial direction in the assembled state of the bicycle chain, a portion of the first sprocket outward surface used to define the axial space being an outward-most surface of the first sprocket in the axial direction, and
- the axial space being larger than 0 mm and equal to or smaller than 0.15 mm.