Gaaah! I sometimes hate the inner tread problems the IS has. Its soo annoying! =( I had a slow leak on the left rear. I was just thinking it must be from a nail or something.. but once I saw him walking back through the discount tire window.. I already knew it was the inside tread, but I was hoping it was a nail! Then the guy told me my inner tread was trashed.. and I ended up buying two new sets of rear tires, because I wanted the same wear on each..