Abstract: A modular drive system is for a bicycle that has a wheel support tube, a pedal crank, and a rear wheel. The pedal crank is coupled to a pedal gear for rotation therewith and the rear wheel is coupled to a wheel gear for rotation therewith. The drive system comprises a shaft having first and second ends spaced at predetermined positions along a single longitudinal access. The shaft is substantially parallel to and spaced from the wheel support tube and has a first gear attached adjacent to the first end and a second gear attached adjacent to the second end. The shaft also has at least one retainer section that has a diameter different than other adjacent sections of the shaft. A first bracket is adjacent to the pedal gear and carries a first shaft support having an opening sized to rotatably receive a first portion of the shaft. A second bracket is placed adjacent to the wheel gear and carries a second shaft support having an opening sized to rotatably receive a second portion of the shaft.

Abstract: A vehicle communication system provides for enhanced communication with passengers using in-vehicle entertainment systems. A microphone is activated by a driver or passenger, and sound is broadcast from the microphone to at least one loudspeaker. In addition, a broadcast of audio signals from an in-vehicle entertainment systems to headphones worn by a passenger is interrupted.