For a disc specific rim that will work fine with anything from a 700 x 28 tire all the way up to a super fat 29er tire (something like 56-622), the Mavic TN719Disc rim is an excellent choice. I've been using them for a couple of years, they're very high quality rims. Welded seam, single eyelet, disc specific, available in 32h or 36h. The wheels I built with them are 36h. Very bombproof for off road riding.
