| 摘要 |
The energy efficient bicycle provided includes a seat mounted to a frame, and front and rear wheels rotatably mounted to a frame. The rear wheel is positioned approximately below or rearward of the seat. The bicycle includes a pedal crank assembly rotatably mounted to the frame. The pedal crank assembly is positioned coaxial with the rear wheel. The pedal crank assembly is driveably coupled with the rear wheel to allow for propulsion of the bicycle. The bicycle may further include a gear changing mechanism including a driving gear set engaged with the pedal crank assembly, and a driven gear set fixedly coupled to the rear wheel. The driving gear set is engaged with the driven gear set using a drive belt. The gear changing mechanism operates to move the drive belt along the driving and driven gear sets to change gears on the bicycle.
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