This frame is Through Axle 12x148mm, I wonder if I can use my 12x142 wheels with a Novatec D772 hub with some sort of an adaptor?
Nope, I don't think so. From what I've heard of the 12x148 "boost" it's completely incompatible with the 12x142. :|
See: "end cap swaps"
http://www.pinkbike.com/news/sram-announces-new-hub-standards-boost-148-and-110-2015.htmlBut - I'll bet someone will come up with a spacer kit that fills in the non-drive side and somehow shifts the brake caliper inboard. In fact - if you have a spacer on the non-drive side that fills the 6mm gap, and you shift the brake caliper (or shift the rotor, or maybe do 3mm inboard on the caliper and 3mm outboard on the rotor?) then you would have to re-dish the rear wheel 3mm to the non-drive side, which would actually give you the same benefit as running an off-center rim, and at least some of the benefit of a dedicated Boost 148 hub.
So, technically, no. But I'm quite sure there will be several folks who are probably actively designing something to do this right now. That's completely a guess on my part.