Originally Posted by
jowilson
When I use the third chainring (rarely) with the highest gear on the rear, the chain clinks up against the derailleur and with the 2nd and 1st chainring, this rarely happens. Annoyance is another reason I don't use the third chainring.
Josh
That's because you aren't meant to do that, it runs the chain at an angle which causes faster wear and, as you've seen, can cause it to rub on the front derailleur cage. I don't usually use my small chainring with anything other than my lowest 3-4 sprockets (on a 7 or 8-speed).