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The Bicycle of today's bicycles have a frame with upright seating much like a bicycle chain for the first [9] Such upright bicycles almost always feature the diamond frame, a network composed of two triangular-shaped. The front triangle and the rear triangle. Triangle in front of the head tube, top tube, down tube and seat tube is formed. The head tube is a headset, the set of bearings that allows the fork, gently turn the steering and balance. Top tube connects the head tube and down tube at the top of the seat tube to the head tube, bottom bracket. The rear triangle consists of the seat tube wrench and pair, and green beans. Chain is held parallel to the chain, connecting the bottom bracket to the rear wheel axis of the house. The seat stays connect the seat tube at the top (or near the same point at the top of the tube) and the fork ends.

Historically, women's Bicycle frames had a top tube that connected in the middle of the seat tube instead of the upper, and lower the height of the guard's structural integrity at risk of harm, as well as the strength of the seat tube, and bicycle frame members are usually tilted to the weak bending loads. This design is known as frame-pass or open frame, allows the rider to mount and dismount in a dignified way while wearing a skirt or dress. Some women's bicycles continue to use this frame style, however, there is no change, mixte, ie, the top tube laterally into two thinner tubes that bypass the seat tube on each side, and the ends connected to the swingarm. Ease of walking with limited flexibility or other joint problems, those estimates. His image of a bicycle as a permanent "woman", step through frames are not common to larger frames.

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