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The head tube contains the headset, the bearings for the fork via its steerer tube.

In an integrated headset, cartridge bearings interface directly with the surface on the inside of the head tube, on non-integrated headsets the bearings (in a cartridge or not) interface with "cups" pressed into the head tube.

The rear triangle consists of the seat tube joined by paired chain stays and seat stays.Banned from bicycle racing in France in 1934 to avoid rendering diamond-frame bicycles obsolete in racing, manufacturing of recumbent bicycles remained depressed for another half century, but many models from a range of manufacturers were available by 2000.The uncommon prone bike moves the cranks to the rear of the rider, resulting in a head-forward, chest-down riding position.connects the top of the head tube to the top of the seat tube.In a traditional-geometry diamond frame, the top tube is horizontal (parallel to the ground).