a bicycle frame includes a body and a rigid or vertical suspension and an interchangeable triangular rear assembly . the body includes three pultruded profile sections interconnected by three overmolded housings made of a thermoplastic material comprising a semi - aromatic resin matrix . the interchangeable triangular rear assembly may be mechanically secured to the body via bosses and an output coupling . the frame has vibration damping properties . a method for making and assembling the same is also disclosed .