I am so tired of my bicycle tires getting flats, i have the kind of tubes that have the slime and yeah they do work but i still get flats, every time i change my tubes i always check to see if something in still in the tire so i don't get another flat, well i have looked up heavy duty tubes and i cant afford them, does anyone know of some tips i could do or something that is around the house that i could put in my tired to make the walls thicker or something. please help me and if you are going to give some stupid immature answer then don't bother, help?