It is possible this belongs in the tires section, but more will read it here. In order to simplify all the stuff I carry on an already heavy bike, I bought a can of Bikes only fix-a-flat, made for Accessories Marketing, Inc from K-Mart. A week ago I was at a cruise-in, walking around taking pictures and when I returned to the e-bike, the front tire was flat. Pulling out my trusty fix-a-flat can, I found the screw on fitting wouldn't fit the valve stem. I messed around for 15 minutes or so before I gave up and walked the 8 blocks home with the front wheel in hand. At home I replaced the tube with a new, factory slimed tube and returned to the bike. Today I was in K-Mart and tested every fix-a-flat can on the shelves on the bikes in the store. Every one had such poorly mis-molded threads that none would screw onto a valve stem. They just wouldn't fit. I informed the store of this and left. Before purchacing a can of fix-a-flat for bikes, try screwing the threaded tube end onto the bike valve stems in the store to see if it will fit. Otherwise, the one time you need it, it will fail you.