After warping a standard Trek rear rim at 255lbs, bought a set of Rhyno Lites off fleabay, 36h, and have occasionally hit hard potholes without damage (bloody well NOT intentional). Reviewers called them "bomb-proof" and a member said he leapfrogs boulders without damage.... Cost, dunno, got mine used for 75 usd with hubs and a 9 speed cassette. All still going strong years later.