After my run from Moree to the Oxley highway a couple of weeks ago i have noticed a flat strip developing around the middle of the tyre. Most likely because most of the road to and back is pretty much straight road. So now when im cornering i can feel when it gets to the edge of the flat spot and the bike feels like it drops over as i go past the edge to the normal curved part of the tyre. Is this normal or something to worry about? if so how do i get rid of it?