i dont know lol it is right where the tunnel changes angles a little bit there is a slot cut in there so it doesnt kink,,, as to why they have that tiny little bracket there,,, so ya over time it just tore all the way up... the one side worse then the other...i guess they are not meant to be abused as much as i do lol
ya man they are sweet i used huck bolts to fasten them so they arent going anywhere lol... these with the new boards amazing how much stiffer everything is