Another thing to consider if it is a wire bead and not a folding tire. I had a problem with two tires I had shipped to me, wire bead and double looped to make for a smaller shipping package. The figure 8 looping caused a bend in the wire bead on one side, no matter how many times I mounted it, it would have the 'bump'. Many good suggestions already. A third tire I had would not properly mount unless I added some kind of lube, okay for home mounting because lube is readily available, but out in the wild with a flat it would always 'hump'. Just had to live with it until homey to do a lubed remount....weird riding experience for sure....