i was thinking in terms of a large overlap to the rear fender, both in front and behind the wheel opening. i agree that the leading edge could have some kind of extra attachment method so the wind wouldn't get under it, but not sure what this would be. i really want to be able to get to my wheel easily.
i read a website for a company selling magnetic signs that mentioned rounding the corners to prevent high speed falling off.
my other choice at the moment is 7 L-type brackets, to the inner lip of the wheel well, and then a coroplast cutout cover with short screws to this.
i'm not giving up on the magnet idea yet-- it would be the easiest on-off.
i am trying to attach a pic but not sure if it will let me yet....
