My bike has been feeling weird in low speed turns , and a strange vibration going on in these turns almost like riding on milled pavement before new hot top is put down .... I noticed my front tire has been wearing very strangely , the centerline is raised and the sides are worn inwards but no signs of outright cupping .... I run the tire at 39 lbs... Anyone else run into this ? Rear tire looks like new with no odd wear I can see or feel . 11,800 miles on the tires .