CURT Extendable Trailer Hitch Bike Rack Mount, Fits 1-1/4, 2-Inch Receiver, 2 or 4 Bicycles Model 18030CURT Extendable Trailer Hitch Bike Rack Mount, Fits 1 1 4, 2 Inch Receiver, 2 or 4 Bicycles Model 18030 Whether you are an avid mountain biker or a casual rider, you will want CURT along for the ride. CURT bike racks offer both versatility and quality and are available in several different styles to fit your needs. CURT standard hitch mounted bike racks are anything but average. They feature an adjustable shank to fit either a 1 1 4" or 2" receiver