Thanks Glenn, I'm really digging it too, I've been riding it every morning and hope to hit the trails again tonight if it's not too rainy. The rims came from a Specialized Stumpjumper and are fairly narrow, I believe they're marked 1.5". I haven't measured the tires' inflated width, I'll break out the calipers later.

RFC - the tires roll easier than a set of Geax Sedonas that I have on another bike (I think they're 2" wide.) They are easily twice the weight, and I can feel it in the steering and acceleration. I like the cushion that I get at 35psi, but I'm curious about how they'll roll at their 65psi max. I managed to get into top gear on a slight decline, but I don't think I could push them that fast on the flat.