I'm new to Trek and to road biking and have had my 2010 Trek Madone 4.5 for two weeks now. My concern is that the chain is slipping in several gears (13 - 16). I also notice a clicking when I coast (not pedaling) and then start back in again. It makes a clicking sound (not everytime, but enough)? I am not sure if I am doing something wrong when shifting, but can't think of what that might be. I am hoping it is just an adjustment that needs to be made and will be taking it back to the LBS, but was wondering if anyone else has had these problems with a new bike (about 50 miles on it so far as it has been raining quite a bit). Thanks for your help.