Strange thing happened to me today.
Yesterday i changed my tube because the former one was no longer patchable (damn glueless patches).
My tire is a 700x25c, so i put a bontrager 700/18-25 tube and start to pump. The tube doesn't seem to fill the tire very well but i haven't reach the recommanded pressure yet, so i keep pumping to 90psi... Looks good.
This morning i take my bike, and i feel a bump every wheel turn. Now i have spend half an hour trying to put the tube and tire back to place but the only thing i can do is move the tire bump. It seem that the tube isn't pushing the tire radially enough to place the tire beads in the bead sits, causing an unround tire.

Tonight i will swap tube, but have i done something wrong with this one ?