![]() lower head lug joins the head tube and down tube.upper head lug joins the head tube and top tube.bottom bracket shell joins the chain stays, seat tube, and downtube, and includes a threaded cylindrical socket for the bottom bracket.seat lug or seat cluster joins the top tube and seat tube the ends of the seat stays are usually brazed directly to the sides or back of the seat lug, although some newer designs of seatlugs also have sockets for the seat stays.Four lugs which may be used to construct a typical diamond frame include: When brazing a bicycle frame, builders may use a small positioning structure called a jig to hold the tubes in place and maintain their precise alignment and frame geometry. ![]() The lug greatly increases the strength of the joint by distributing the molten filler metal over a larger surface area via capillary action. ![]() The end of the tubes are inserted into the lugs and subsequently brazed with a silver or brass filler metal. ![]() Before assembly, the builder cuts the tubes to the desired length and precisely mitres their ends, providing a tight fit. Lugged steel construction uses standard cylindrical steel tubes which are connected with lugs, external fittings made of pieces of steel (sometimes stainless steel) which fit over the ends of the tubing. ![]()
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