I've been building up a road bike for the past few weeks and it's pretty much done except that I am having some issues with shifting down in the front. Sometimes when I am in the smaller half of the cassette the teeth of the small ring don't latch onto the chain on the downshift and it takes a few revolutions for it to snag. The front derailleur seems fine otherwise. I made sure to check for rub in big/small and small/big combinations.