Ok. so i was riding my mountain bike on the street no rough terrains. I was riding it (L)2 (R)4. then i changed the right shifter wile i was a turning and then studenly it started making a funny noise i stopped to see whats up . i noticed that the back tire was looking more to right side and wasnt strait. the tire was actually Scratching the metal on the right i tryed to force it back but i couldnt. how can i repair that..please help