A bicycle hub apparatus comprising: an axle , a hub member supported for rotation around the hub axle ; a sensor shaft supported for rotation around the hub axle and having a first portion and a second portion, wherein the first portion of the sensor shaft is structured to receive an external rotational driving force, wherein the second portion of the sensor shaft is coupled to the hub member for communicating the rotational driving force to the hub member, and wherein the second portion of the sensor shaft is disposed relatively between a first flange of the hub member and a second flange of the hub member; and a force sensor unit disposed on the sensor shaft , and characterised in that a dynamo disposed within the hub member, wherein the dynamo receives rotational driving force from at least one of the sensor shaft or the hub member, and the second portion of the sensor shaft being disposed at substantially an axial center of the hub member, and in that the apparatus further comprising an intermediate drive member supported for rotation around the hub axle and having a first portion and a second portion, wherein the first portion of the intermediate drive member is structured to receive the external rotational driving force, and wherein the second portion of the intermediate drive member communicates rotational drive force to the first portion of the sensor shaft , wherein the intermediate drive member and the sensor shaft are coupled to each other within the hub member, and the second portion of the sensor shaft is coupled to the hub member between a first flange of the hub member and a second flange of the hub member. an axle , a hub member supported for rotation around the hub axle ; a sensor shaft supported for rotation around the hub axle and having a first portion and a second portion, wherein the first portion of the sensor shaft is structured to receive an external rotational driving force, wherein the second portion of the sensor shaft is coupled to the hub member for communicating the rotational driving force to the hub member, and wherein the second portion of the sensor shaft is disposed relatively between a first flange of the hub member and a second flange of the hub member; and a force sensor unit disposed on the sensor shaft , and characterised in that a dynamo disposed within the hub member, wherein the dynamo receives rotational driving force from at least one of the sensor shaft or the hub member, and the second portion of the sensor shaft being disposed at substantially an axial center of the hub member, and in that the apparatus further comprising an intermediate drive member supported for rotation around the hub axle and having a first portion and a second portion, wherein the first portion of the intermediate drive member is structured to receive the external rotational driving force, and wherein the second portion of the intermediate drive member communicates rotational drive force to the first portion of the sensor shaft , wherein the intermediate drive member and the sensor shaft are coupled to each other within the hub member, and the second portion of the sensor shaft is coupled to the hub member between a first flange of the hub member and a second flange of the hub member. <EOS>