Just put my new MH90 tire on my new 21" laced wheel and the tire refuses to seat on the rim on one side. One section of it just won't seat. I've let out the air, lubed the area and on and on. Just won't do it for some reason. The other side seats fine. Nothing wrong with the rim and the tire looks fine. I took it to 60lbs, but don't think I want to go beyond that without a cage.