The present invention relates generally to a bicycle rack system providing for bicycle transportation of articles, and more particularly to a system for a quick release, modular, and expandable bicycle rack system. The present invention comprises a bicycle rack system comprising a bottom connector comprising two portions; a front top connector comprising two portions; a rear top connector comprising two portions; tubes both hollow or solid inserted within and secured by the bottom, rear top, and front top connectors; and an adjustable female receiving plate and male insert that is attached to the adjustable female receiving plate. The male insert and female receiving plate are disposed adjacent to a bicycle axle and securably attached to the bottom connector. The unique configuration of the bicycle rack system provides a modular, sturdy, and easily installed bicycle rack.