Gear cables replacement - inline barrel adjusters I'm in the process of ordering replacement gear cables for my road bike which has 105-5800 groupset. My existing cables have inline barrel adjusters and I was wondering:


Are the inline barrel adjusters reusable? (I'm not opposed to replacing even if they are)
If I have a barrel adjuster on the rear derailleur, do I really need an inline adjuster as well? (I need to verify setup for front derailleur)
Is there an optimal position on the cable for them to be installed?
Yes. Barrel adjusters are reusable.
More useful for the front mech which doesn't have any on-the-fly adjustment.
And useful for the rear mech for quick adjustment without having to get out of the saddle.