Rear Door (Hatch)
If you don’t have a towbar and are not interested in roof racks, rear strap on bike racks are a great option. These are typically your best $ per bike scenario, therefore generally providing the least expensive way to transport your bike.
These carriers mount to your boot or hatch door using a number of straps with rubber coated hooks that are used to secure them to the vehicle. They are generally fairly lightweight, and the same rack can be generally moved between compatible vehicles.
A consideration is that these racks will often prevent you from being able to open your boot or hatch while it is attached. Finally it must be noted that unlike a towbar, there is no trailer plug to utilise should you want to attach a lightboard for your number plate.