thats not a roll cage or something that will save ur legg..
its called a CRASH CAGE, i use it here in california, san francisco on my cbr600f4i, i stunt it in the parking lot with a bunch of stunters and i drop my bike each time 3-4 times, trying to slow wheelie or stoppie and the crash cage protects the frame, nothing else.
also check out my video, let me knw what you think
//youtu.be/http://www.youtube.com/watch?v=rUEPeLgJlJE
http://www.youtube.com/watch?v=rUEPeLgJlJE