Planar ratchet assembly for human-powered vehicle

A planar ratchet assembly for a human-powered vehicle, the planar ratchet assembly comprising:

• a first ratchet member including a first axial surface defining a plurality of first serrated teeth, the first serrated teeth having a first driving surface, a first non-driving surface and a first tooth tip, the first tooth tips connecting corresponding ones of the first driving surfaces and the first non-driving surfaces, at least one of the first non-driving surfaces including a first convex curved surface that has a first radius of curvature of at least 0.5 mm;
• and
• a second ratchet member including a second axial surface defining a plurality of second serrated teeth, the second serrated teeth having a second driving surface, a second non-driving surface and a second tooth tip, the second tooth tips connecting corresponding ones of the second driving surfaces and the second non-driving surfaces, at least one of the second non-driving surfaces including a second convex curved surface that has a second radius of curvature of at least 0.5 mm,
• the first ratchet member and the second ratchet member being configured to rotate together about a rotational axis in a driving direction where the first driving surfaces contact the second driving surfaces, and at least one of the first ratchet member and the second ratchet member being movable in an axial direction of the rotational axis to permit relative rotation between the first ratchet member and the second ratchet member about the rotational axis in a non-driving direction where the first non-driving surfaces and the second non-driving surfaces slidably contact each other,
• the at least one of the first non-driving surfaces including a first planar surface extending at least in the axial direction, the first tooth tips including a first flat surface extending substantially perpendicularly with respect to the axial direction, and the first convex curved surface connecting the first planar surface and the first flat surface.