A buddy has a Scott Speedster flatbar that he wants to convert to dropbars. All i know so far is that rear der is Sora, but i'm asking for more details.

How does that setup work? Is it road bike brakes/ders set up with shifters/brake levers designed for flatbar but for road pull ratios?

If that's so then he just needs brifters that work with whatever gen components right?

The other Q would be stem length when going from bars to drops.

I am thinking the only difference between speedster flatbar and dropbar is the stem/bar/bar-components, but not sure.