The two guards pictured above seem suitable only for single chainrings. I have a triple but almost never use my large chainring except to snag my pants and shoelaces. I saw a "how to" on grinding the teeth off the big chainring to make it a bash guard. I don't want a solution quite that irrevocable. I have been mulling on some sort of soft tubing that could be pressed onto the teeth to make it snag free but would be easy to remove if I wanted to join a paceline or some such.