I have a new Trek Pilot 2.1 with Shimano 105 and the gears were making a racket so I brought it in to LBS for adjusting and it was OK for a while but then it started again. I took it in Sunday afternoon after my ride and explained to the tech what was going on. It was just an adjustment that took less than 10 minutes. He also adjusted my brakes and lubed my chain. He also advised me to bring it by for the 1 month tune up which I made an appointment for.

I rode last night and it was like riding a different bike. No noise and smooth shifting. Needless to say I'm very pleased! So take your bike over to your LBS - its worth the trip!!
Patty