Looks like the geo is optimised for lower travel forks, I too thought they could handle up to around 150mm but perhaps not... bloody expensive for what it is, a Stanton Slackline is almost half the price, and is a hell of a frame, I have one and it is amazing. The BTR did pop up as a possibility when I was looking at steel hardtails, but something turned me off it, can't remember what it was, could've been the price or the lack of long travel fork compatibility.