A bicycle rack system for transporting bicycles within a pickup truck is disclosed. The system attaches to the inside of the pickup bed using an L-shaped base bracket which extends through the aperture between the truck bed and the tailgate. During a period when the tailgate is in the horizontal (open) position, a gap exists between the tailgate and the truck bed. Once the tailgate closed, this gap disappears. has and drapes over the pickup's existing tailgate, thereby providing support and contact surfaces for transporting one or more bicycles in an upright position. In an embodiment, the bicycle's front wheel drapes over and outside the pickup's tailgate and the rear wheel rests within the bed of the pickup truck.