What is a Roll Bar?

The roll bar is a single bar behind the driver providing moderate rollover protection. Due to the lack of a protective top, some modern convertibles use a strong windscreen frame acting as a roll bar. A roller hoop can also be placed behind both headrests - usually one on older cars - virtually a roller bar spanning the width of a passenger's shoulders.

In motorsports, the introduction of the roll bar happened in 1961. In 1968 FIA decided that the roll bar must be a minimum of 50mm above the driver helmet. 1976 additional forward rollover structure was made mandatory. 1999 this rule improved driver safety further by imposing a new distance between a line connecting the main roll structure with the secondary roll structure in the front of the driver to 70 mm. Since then, the teams have pushed the boundaries of design to ensure the principal roll structure is as light as possible, with minimal influence on aerodynamic performance, but still providing the best protection for the driver in a rollover event.

What is a Roll Cage?

A roll cage is a specially constructed tubular frame built in or around a vehicle cab to protect its occupants from injury in an accident or rollover event. A standard feature in racing cars and stunt cars, the roll cages are made of steel tubes and include a geometric design to enhance stability and strength.

Roll cages help to stiffen the chassis that is desirable for racing applications. Racing cages are typically either bolt-in or welded-in, with the former easier and cheaper to fit while the latter is stronger.

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