Prettyshaddy has the right idea. Unless the tires are real contrary. Most of the time you can just remove one side of the tire in the area of the leak and reach in and snake the tube out, patch it, and reassemble. I guess U might want to put some air in after re-assembly. After you do it a couple of times it takes about 5 min. to fix a flat. If you don't have fenders it is real easy. Some tires don't even require tire tools but it is easier if you do have them.