GT Bicycles is a large American manufacturer of road, mountain, and bmx bicycles. GT mountain bikes are often readily identifiable by the unique "triple triangle" frame design present in most hard-tail designs. Early BMX frames were also easily identifiable as the top tube seemed to bisect the seat tube and protrude beyond it by approximately an inch-and-a-half towards the rear of the frame. This innovative idea was claimed to reduce the amount of vibration transferred to the seat fr (  Wikipedia |  GT site )

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