Did you get your roll bars from Street Beasts or somewhere else? I have a Street Beasts Cobra and their roll bars. They have a bolt thru the tubes that can be removed. The rear tube has a bolt at the top and the others, a bolt just above the "anchor point" on the frame. If you have some "home made" or other brand roll bars, this may not help.
Here is a picture that hopefully you can figure out.
