[EricH]

Originally Posted by thefro526

According to the 2011 rules, a full perimeter is not required for bumper mounting. The method Chris posted above is perfectly legal.

To add to that, the definition of frame perimeter does not require that the outer perimeter be solid material. If I had blocks sticking out each corner on a diagonal, the outer edges of those blocks define the frame perimeter. (Now, to attach bumpers, I'd need further blocks in the middle. But that's not counted in the definition of frame perimeter.)

Note, all the rules stuff is subject to change for next year. Therefore, after Kickoff, any answer given in this thread should be reviewed for compliance with the 2012 rules.

Regarding attachment, I've heard of rivets (drill the rivet out to change bumpers), blind nuts embedded in the back of the backing, quick-disconnect pins of various stripes, and various bracket systems. I've never had a problem with the blind nuts, except that on occasion they can fall out (a dab of glue when installing can do wonders for that) and depending on your robot's design, the bolt heads can be "fun" to get a wrench onto.