Frame The frame may be the heart with the bicycle. It can be the mechanical core that provides points of attachment for the a variety of components that make up the machine. Most frames are diamond shaped consisting of two triangles: front triangle and rear triangle. The front triangle is created up of head tube, best tube, down tube and seat tube. It is probably the most essential of all the bicycle parts. The rear triangle consists from the seat tube and paired chain stays and seat stays. Drive-train and Gear Drive-train and
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