| A bicycle frame is the main component of
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| | rider's groin while straddling the bike
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| a bicycle, onto which wheels and other
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| | and standing on the ground is called
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| components are fitted. The modern and
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| | clearance. The total height from the
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| most common frame design for an upright
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| | ground to this point is called the
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| bicycle is based on the safety bicycle,
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| | standover height.
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| and is made of two triangles, a main
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| | Down tube
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| triangle and a paired rear triangle. This
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| | The down tube connects the head tube to
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| is known as the diamond frame. The main
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| | the bottom bracket shell. On racing
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| triangle consists of the head tube, top
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| | bicycles and some mountain and hybrid
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| tube, down tube and seat tube. The rear
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| | bikes, the derailleur cables run along
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| triangle consists of the seat tube, and
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| | the down tube. On older racing bicycles,
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| paired chain stays and seat stays. The
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| | the gear levers were mounted on the down
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| head tube contains the headset, the
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| | tube. On newer ones, they are integrated
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| interface with the fork. The top tube
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| | with the brake levers on the handlebars.
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| connects the head tube to the seat tube
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| | Bottle cage mounts are also on the down
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| at the top, and the down tube connects
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| | tube. In addition to bottle cages, small
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| the head tube to the bottom bracket
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| | air pumps may be fitted to these mounts
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| shell. The rear triangle connects to the
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| | as well.
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| rear dropouts, where the rear wheel is
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| | Seat tube
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| attached. It consists of the seat tube
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| | The seat tube contains the seatpost of
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| and paired chain stays and seat stays.
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| | the bike, which connects to the saddle.
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| The chain stays run parallel to the
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| | The saddle height is adjustable by
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| chain, connecting the bottom bracket to
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| | changing how far the seatpost is inserted
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| the rear dropouts. The seat stays connect
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| | into the seat tube. On some bikes, this
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| the top of the seat tube (often at or
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| | is achieved using a quick release lever.
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| near the same point as the top tube) to
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| | The seatpost must be inserted at least a
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| the rear dropouts.
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| | certain length; this is marked with a
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| Unless otherwise specified, the remainder
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| | minimum insertion mark.
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| of this article focuses primarily on the
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| | The seat tube also may carry bottle cage
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| diamond frame.
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| | mounts.
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| The diamond frame consists of two
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| | Chain stays
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| triangles, a main triangle and a paired
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| | The chain stays run parallel to the
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| rear triangle. The main triangle consists
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| | chain, connecting the bottom bracket
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| of the head tube, top tube, down tube and
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| | shell to the rear dropouts. When the rear
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| seat tube. The rear triangle consists of
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| | derailleur cable is routed partially
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| the seat tube, and paired chain stays and
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| | along the down tube, it is also routed
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| seat stays.
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| | along the chain stay. The chain stays
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| Head tube
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| | provide a mount for rear disc brakes.
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| The head tube contains the headset, the
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| | Seat stays
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| interface with the fork. In an integrated
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| | The seat stays connect the top of the
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| threadless headset, the bearings
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| | seat tube (often at or near the same
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| interface directly with the metal surface
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| | point as the top tube) to the rear
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| on the inside of the head tube.
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| | dropouts. When the rear derailleur cable
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| Top tube
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| | is routed partially along the top tube,
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| The top tube connects the head tube to
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| | it is also routed along the seat stay.
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| the seat tube at the top. In a mountain
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| | One combination aluminum/carbon fiber
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| bike frame, the top tube is almost always
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| | racing frame design uses carbon fiber for
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| sloped. In a traditional-geometry racing
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| | the seat stays and aluminum for all other
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| bicycle frame, the top tube is
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| | tubes. This takes advantage of the better
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| horizontal. In a compact-geometry frame,
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| | vibration absorption of carbon fiber
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| the top tube is sloped. See Road and
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| | compared to aluminum.
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| triathlon bicycles for more information
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| | A single seat stay refers to seat stays
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| on geometries.
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| | which merge onto one section before
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| Control cables are routed along mounts on
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| | joining the front triangle of the
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| the top tube. Most commonly, this
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| | bicycle, thus meeting at a single point.
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| includes the cable for the rear brake,
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| | A dual seat stay refers to seat stays
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| but some mountain bikes and hybrid
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| | which meet the front triangle of the
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| bicycle also route the front and rear
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| | bicycle at two separate points, usually
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| derailleur cables along the top tube.
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| | side-by-side. The seat stays also provide
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| The space between the top tube and the
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| | a mounting point for the rear rim brakes.
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