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The size of the seatpost is dependent upon the internal dimensions of the seat tube of the bicycle frame. They come in various diameters, lengths and offsets. Offset is the distance between the centerline of the seatpost tube, and the centerline of the clamp area. Shims are often available to adapt a too-small seatpost to a too-large seat tube.
Seat lug: a frame lug on the top of the seat tube serving as a point of attachment for a clamp to secure the seat post; Seat tube: the roughly vertical tube in a bicycle frame running from the seat to the bottom bracket; Seat bag: a small storage accessory hung from the back of a seat; Seatpost: a post that the seat is mounted to. It slides ...
Bottom bracket bearings fit inside the bottom bracket shell, which connects the seat tube, down tube and chain stays as part of the bicycle frame. The term "bracket" refers to the tube fittings that are used to hold frame tubes together in lugged steel frames [ 1 ] which also form the shell that contains the spindle and bearings; the term is ...
A bicycle saddle, sometimes called a bicycle seat, is one of five contact points on an upright bicycle, the others being the two pedals and the two handles on the handlebars. (A bicycle seat in the specific sense also supports the back.) [ 1 ] The bicycle saddle has been known as such since the bicycle evolved from the draisine , a forerunner ...
The bottom bracket shell is a short and large diameter tube, relative to the other tubes in the frame, that runs side to side and holds the bottom bracket. It is usually threaded, often left-hand threaded on the right (drive) side of the bike to prevent loosening by fretting induced precession , and right-hand threaded on the left (non-drive) side.
Clockwise from top left: seat lug, upper head lug, lower head lug. This seat lug joins the seat tube, top tube, and seat stays of a steel touring bicycle frame. It also has an opening in which to insert the seat post, and a clamp to hold the seat post securely in place.
The most basic suspension seat post, a piston style, like the one pictured on the side, uses a sliding post with spring pressure that is often changeable by adjusting a threaded insert in the bottom of the post to adjust the preload on the spring. All piston style seatposts move in a down and forward motion at the slope the seat tube.
The lower end of the seat tube was open, and to the rear of the bottom bracket, to allow the seat post to slide all the way down. With the change to a conventional seat tube the only part of the Bootie 'Folding' Cycle that actually folded was the steerer tube (i.e. the handlebars). [1]
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