Quote Originally Posted by sundial View Post
Can someone post pictures of how to adjust the derailleur on a compact double? I'm a visual aids kind of girl. My LBS adjusted it on the stand but when I took it for a ride today, it's not quite right. It works fine in the large gear but when I shift to the 34 and the chain is in the middle of the cassette, it feels like it's slipping on the cassette, like it's not hitting the teeth right. The bike shop isn't exactly convenient to me. My bike is a '08 Specialized Roubaix.
Sounds like it's a rear derailleur issue. It's common for it to seem ok on the stand but to start acting up under load. You probably just need a little turn of the barrel adjuster. Are there any delays in shifting one way or the other (does it keep skipping instead of shifting)? If that doesn't work, check that the B screw is set right and that the derailleur hangar isn't bent.

http://www.parktool.com/repair/readhowto.asp?id=64

(has pictures)