HitchGrip is a unique 3 bicycle rack designed to work with 2" Class III and IV hitch receivers to carry bicycles between the trailer hitch and trailer. The 1-7/8 inch thick rack clamps to the hitch receiver and bolts tight to prevent the rack from wobbling or tipping. A unique design allows vehicles to tow trailers and haul bicycles at the same time, with no worries. Works with bicycles with a frame diameter maximum of 2 inches. *Requires 2" or more available space on the ball mount receiver for clamp attachment*