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Old 05-15-21, 08:26 AM
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If you change from Shimano Tiagra to SRAM anything you will have to change the shifter because it is indexed. The pull ratio, the amount of cable pulled by each change in the index is different. It's not the front derailleur that would be the problem but the shifter so you need to replace the shift lever with a new one if it isn't a matter of adjusting the shifter mechanism. You might ask a moderator to move this to the mechanics section.

Here's a video on how to check the inside of the shifter, What's Inside a Shimano STI Shifter
Look to see if what he calls "the little catches") are worn.

or a more comprehensive video on replacing the shifter if you need to.

VegasTriker is offline