A roof rack is a set of bars secured to the roof of a motor car. It is used to carry bulky items such as luggage, bicycles, canoes, kayaks, skis, or various carriers and containers.
There is a long history of the use of roof racks and their designs. They allow users of an automobile to transport objects on the roof of the vehicle without reducing interior space for occupants, or the cargo area volume limits such as in the typical car 's trunk design.
The most common components of a roof rack system are: towers, fitting pieces (for attaching towers to a specific vehicle ), crossbars, and gear mounts.
Automobile roof racks are split into different types, depending on the vehicle roof :
Rain Gutter - older roof racks were usually mounted directly to the gutter surrounding the roof line.
Bare Roof - many modern vehicles, which do not have gutters, can have a roof rack installed by attaching hooks to the top of the door frames.
Fixed Point - some automobiles have fittings for proprietary racks which mate with reinforced lugs in the roof, or have pre-threaded screwholes.
Side Rails - vehicles with factory -installed rails, which may be flush against the roof or raised off of the roof, running front-to- back on the roof
Factory Bars - other vehicles have a factory -installed permanent roof rack.
Roof racks increase air resistance and in the US, roof racks increased overall fuel consumption by approximately 1%.
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