Would I also need a front derailleur to...
Would I also need a front derailleur to run this setup? I have a single speed e.13 setup upfront right now. I guess all i'm asking is how does this thing work?
Yes, you still need a derailleur. The Shiftring kit just allows you to use with cranks that do not have inner chainring tabs. Instead, one ring mounts to the other ring. The end function is the same and requires a derailleur and shifter to actually switch gears.