Originally Posted by
BarracksSi
Rival has trim for the front shifter in the small ring, doesn't it?
Not first gen, it doesn't. I will soon discover this when I install that groupset. It seems like with Rival you need to setup those limit screws with surgical precision. Also, I'd suppose any cable slip will cause performance issues. 2009 added front trim in one direction only, from what I've read.
WRT to the OP - any extreme gear combinations will be sub optimal for rub. It's life.