The Modular Adjustable Handlebar Kit contains a center mounting segment and linking units of varying degrees of angles, curves and/or segments with differing shapes both radius and straight and/or compounded curves with straights. Each of the linking units have a male and female end and are attached to adjoining linking units and center mounting segment via means of a plurality of aligning openings spaced about the circumference of each end of the linking units and a securing mechanism. The openings on the male end of the linking units form inner and outer rows, in which the openings are offset from each other. The female ends of the linking units have front and rear openings which are generally parallel to each other. The securing mechanism may be a clamping device and may utilize a dowel which extends through the aligned openings on the adjoined linking units. The clamping device is then secured to prevent disengagement of the pin.