Originally Posted by
alfeng .
While I do not have as high a regard for SRAM's Road components as many other people have, I have to believe that if-and-when set up to spec, it will function smoothly ...
Which is to say that if the shifting problem which you are experiencing has always existed then the problem is due to a casual, initial prep (
or, lack of!!) by the dealer prior to letting you roll the bike out the door ...
Which is to say that YOU probably want to check the front derailleur's cable AND (
particularly) housing ...
- if you have a workstand, then try the following ... if you don't have a workstand then for this "test" you can double-tap while the chain isn't moving, lift the rear of the bike off the ground & turn the crank to see how far the derailleur cage moves over because THIS test is really just to check the derailleur cage's ease & range of motion
[*] with the bike in the stand & with the chain on the outer chainring try to downshift to the inner chainring ...
[*] if the chain does not drop down to the inner chainring then RELEASE the derailleur cable from the front derailleur AND see if the derailleur cage subsequently moves over far enough to allow the chain to shift onto the inner chainring as you turn the crank ...
If the chain executes the shift, then the problem IS with your cable and/or housing ...
If the cable housing has a
coiled core then ensure that the ends are free of burrs [this may mean unwrapping the handlebar tape to facilitate inspection] & LUBE the cable
or REPLACE both & ensure that the ends of the housing are not ragged + that you lube the cable.
BTW. If SRAM uses the same dubious (
IMO)
parallel stranded cable housing which Shimano & Campagnolo have been snookered into using then ensure that there are ferrules on BOTH ENDS
or replace the parallel stranded cable housing with Brake Cable housing.
There is one other possible resolution, but I think you should investigate the possibility that the cable and/or housing are at fault.