What features are recommended for gear cabling to suit Shimano Tiagra front & rear derailleurs?
I'm pretty happy with the performance of the cabling the bike came with, I haven't had any issues shifting. I don't have any information on what components were used though.
I've found PTFE coated stainless steel inner cables, non-PTFE coated stainless steel inner cables, and non-lubricated outer housings all sold separately. I've also found pre-lubricated & sheathed outers included with kits that come with the complete set of inner / outer / ferrules / endcaps.
Would I run into any shifting issues if I used a less expensive inner or outer that didn't come pre-lubricated, and if so could I apply a 3-in-1 chain lube or teflon grease to the inner cable to improve shifting? Or would I really notice a difference with shifting on a 2x10 Tiagra groupset by installing a higher end kit that came with all components included and pre-lubricated? Would there be any issues with replacing the inner cable only?
Edit: Bike is a 2019 Giant Fastroad SL-1 with Tiagra 4700 groupset.