[vin63]

There can be significant differences in specifications, materials, welding process and applications. The "roll cage" specification encompasses the driver 360 degrees, which does not necessarily require a main hoop supported by rear braces. However, a "roll bar" does specifically require a main hoop and it must be supported with rear braces. As far as supporting the main hoop "over the head" of the driver in a "roll bar" configuration, that is also determined by the type of tubing you use for the rear braces. Otherwise, if the same material is used for the main hoop and rear braces, the highest point the rear braces can be welded to the main hoop is 5", or lower, from the top of the main hoop. But, in the end, it's what the track tech inspectors permit or deny. Check with your local track tech inspectors.

Originally Posted by ptc

Whether its called a 'bar' or a 'cage', the MAIN hoop is supported one direction or the other by welded attachment by 2 other points minimum, to 'keep from collapsing'. That is the intent of the rule I would think. If its 4 points forward or 4 points rearward, why should it matter if the MAIN hoop is supported over the drivers head?