The answer depends on the car’s model, as the bike rack for - the trunk lid can be used for most car brands, but it won’t fit Sedans. Such a solution provides a large number of soft and flexible connections, which require constant monitoring of the system’s fixation to the car. No need to retrofit the car with a tow bar or roof rails. - the back door is available for hatchbacks, station wagons, crossovers, and minivans. - the tow bar can be installed only if the latter accessory is present. - the roof requires the presence of roof rails (if the car isn’t supplemented with it, you should choose another type or purchase rails).