I'm considering getting a Shaver 29 and need a little help deciding which size I should get. I am 5'7" with a 30" inseam and can't decide between a medium and small. According to the Foes manual I should get a medium. I usually ride a medium, but I have never ridden a Foes. My main concern is the seat tube length on the medium. At 18.5 inches I worry that I will not be able to use a dropper post on this bike. The small has a 17" seat tube which I like. Can anyone around my height who has any experience with this bike give me some advice? I will not be able to test ride the bike because I will be buying it online, there are no Foes dealers in my area.