1. Field of the Invention
The present invention relates to shock-absorbing structures of bicycles and more particularly, to a shock-absorbing seat stay for a bicycle.
2. Description of the Related Art
When riding a bicycle on a bumpy road, a bicyclist may feel uncomfortable due to vibration. To ease discomfort of the bicyclist, many bicycles may be equipped at the bicycle frame thereof with a suspension for buffering the vibration. However, the conventional suspension for being installed with the frame of a bicycle usually comprises metal springs, pneumatic device or hydraulic device for achieving the purpose of absorbing vibration, resulting in that the aforesaid conventional suspension is complicated in structure and heavy in weight, and even a part of stepping energy from the bicyclist may be absorbed by the conventional suspension to undesiredly deteriorate the transmission efficiency of energy. Therefore, for a road bicycle built for traveling at high speed with a light-weight specification, the aforesaid conventional suspension composed of metal spring, pneumatic device or hydraulic device is not an appropriate choice. On the other hand, when a bicyclist rides a road bicycle without suspension, the bicyclist may easily and quickly feel tired. Under this circumstance, the bicyclist may have to face a dilemma that he/she can only choose one from a bicycle having high energy transmission efficiency with light weight and a bicycle having suspension that can provide riding comfort.