Transmission assembly of a bicycle

A transmission assembly of a bicycle for being installed on a freehub body of the bicycle, the freehub body being adapted to rotate about a rotation axis and provided with at least one torque transmission portion on a radial outer side for torque transmission, and the transmission assembly comprising:

• a first adapter, comprising a main body portion, wherein the main body portion is sleeved on the freehub body and comprises a first connecting portion, the first connecting portion has a first thread portion, and the main body portion is used to be connected to the torque transmission portion of the freehub body;
• a second adapter, comprising a second connecting portion and a pressing portion connected to the second connecting portion, wherein the second connecting portion has a second thread portion, the second thread portion is adapted to be screwed to the first thread portion of the first connecting portion, and the pressing portion, the radial outer side of the freehub body and one side of the first connecting portion in a direction of the rotation axis surround to form an accommodation space;
• and
• a friction member, disposed in the accommodation space,
• wherein, the pressing portion pushes against the friction member when the second adapter is screwed to the first thread portion, so that the friction member is pressed against the second connecting portion and generates a radial force toward the rotation axis by pressing the friction member, thereby fixing the transmission assembly to the freehub body.