A new and unique highly adjustable stationary exercise bicycle for children or adolescents is presented incorporating a number of features specifically designed for youthful stationary bicycle users. The inner ring components are symmetrical to provide a foundation for uniform surface temperature distribution across the entire area of the inner ring. Also, the power transmission apparatus can be made safer and less noisy for not only automatic operation by the motor but also manual operation by a user, while the gear module, motor, etc. The biasing structure is disposed on the outside of the cover and is adapted to press the dry electrode component against a surface of the object interest when biased by an external structure. The fluctuation of noise on the substrate bias voltage between the source and the well of PMOS and NMOS of the CMOS circuits is reduced. New nodes added to the network learn from other nodes in the network what content they should have and download the required content, in a desired amount, onto their local storage devices from the nearest and least congested nodes without interrupting network operation.