Abstract: A semi-recumbent bicycle allows the rider to sit on a high-backed seat elevated above a rear wheel in a semi-recumbent position with his legs extending forward and angling downward to a pedal crank assembly. The bicycle includes an elongated relatively large hollow main frame or frame member connecting a front steering assembly and front wheel at the front end of the bike to the rear wheel and the seat at the rearward end of the bike. The pedal crank assembly is positioned in the area of the steering assembly above the front wheel. The elongated main frame member has at least one large hollow area, and an access opening with attached door to render the hollow area a convenient integral lockable storage compartment for items such as tools, books, bicycle helmets, and groceries for example.

Abstract: A two wheel bicycle on which the rider sits elevated above and slightly forward of the rear wheel on a high-back seat. The seat is supported by the rearward end of a multiple angled main tube. The position of the pedal crank assembly is forward and upward of the pedal crank position of conventional bicycles and downward and rearward of that normally associated with fully recumbent bicycles relative to the seat. The rider steers by way of long upwardly curved handlebars affixed to an elongated multiple angled steering stem originating in a front steering head tube assembly and extending rearward in general parallel alignment with the multiple angled main tube. The steering stem extends upward and rearward terminating under the area of the rider's upper legs.

Abstract: A two wheel semi-recumbent bicycle provided in several embodiments on which the rider sits elevated above the rear wheel on a high-back bucket style seat supported by an angled top tube. The position of the pedal crank assembly is forward and upward of the pedal crank position of conventional bicycles and downward and rearward of that normally associated with fully recumbent bicycles relative to the seat. The rider steers by way of long upwardly curved handlebars affixed to an elongated steering stem originating in a front steering head assembly. The steering stem extends upward and rearward terminating under the area of the rider's upper legs. One version of the semi-recumbent bicycle features a telescoping angled top tube supporting the seat at its upper end to allow both vertical and horizontal adjustment of the rider's position. Other embodiments are provided with removable seat and chain stays replaceable with stay of various lengths to effectively alter both the size and frame geometries of the bicycle.