To FBinNY
The shifting problem is on my brand new 2015 GT Grade tiagra. When they built it the mechanic supposedly spent an hour setting up the derailers and when I took it out for a quick 2 mile test ride I noticed the the shifting in the rear would sometimes not shift and sometimes would shift 2 gears at once. They said it has to due with the shift cables being fully sheathed and it should break in.