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downhill bike
A downhill bike (also known as a downhill mountain bike) is a full suspension bicycle designed for downhill cycling on particularly steep, rocky trails. Unlike a typical mountain bike, durability and stability are the most important design features, compared to lighter, more versatile cross-country bikes. Downhill bikes are primarily intended for high speed descent, and downhill riders will usually push, or shuttle via chairlifts or motorized vehicles, to the trailhead. Downhill bikes are also very similar to freeride bikes due to large strong frames and more travel.〔
== Geometry==
These bikes will also have very slack head tube angles (66 degrees or less),〔 long wheelbases (over ),〔 and will accommodate the use of up to width knobbed tires. Downhill frames are also overbuilt to handle the stress of riding over rocky terrain, drops, and jumps. Bike weights have been typically over , but modern downhill bikes have broken the weight barrier (with some custom builds on carbon frames weighing between 27-29 pounds) Some newer (2014/5) downhill bikes can be built to weigh under , such as the Trek Session 9.9 or Kona Supreme Operator.
Adjustable head tube angles are also available to adapt the bike to the owner's preferred style of riding.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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