Its between the 16.5" size and the 17" size... If you can try both out, do it... If you can't try either, ask around the boards and see what other 5 foot 7 guys are riding. I'm thinking you would be a 16.5" (small) off the top of my head.
I`m 175cm, just orderd a -09 glory dh frame size M. I have tried a friends -08 glory size S and it felt really small so i tried another friends -07 glory size M and it felt good.