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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.
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 seat post attaches to the seat rails by means of a clamp; 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
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.
Quick release skewer, removed from a hub, in the closed position Hub with its skewer mounted Quick release clamp on a seatpost. A quick release skewer is a mechanism for attaching a wheel to a bicycle. It consists of a rod threaded on one end and with a lever operated cam assembly on the other.
BMX bikes usually have a 22.2 mm diameter clamp size. A more recent standard is a 31.8 mm (1.25″) clamp for both MTB and road bars. This is rapidly taking over from the previous mix of sizes, although other accessories such as some light or computer brackets may also need to be oversized to fit the thicker bars.
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Front axle and seat pin clamp bolt 5 ⁄ 16 inch (7.94 mm) diameter, 24 or 26 tpi threading Rear axle 3 ⁄ 8 inch (9.53 mm) diameter, 26 tpi GB Stems using 5 ⁄ 16 inch (7.94 mm) diameter, 26 tpi for the handlebar clamp