You're just messing with us, right?
39T chainwheel fits on the crankset, 20T sprocket fits on the hub: Sheldon's gear calculator says 19 g.i. low.
That's pretty cool, looking at the images of it on the website, I never would have thought that frame could do this. I'm impressed. Is it noodly feeling?
On the website with the page showing the specs, the igh version chart showed 26- (I think) 94 g.i.