RE: Tire question
Foams help the tire maintain it's shape during cornering and to keep a more consistent contact patch on the ground. Gluing the beads will keep the tire on the rim. Use CA glue to tack your tires on the rims. If you don't have CA glue from a hobby shop handy, superglue that you guy at Wal-Mart or the grocery store is the same thing. When it's time to change tires, if you'd like to keep the same rims, use some acetone to dissolve the CA glue and remove the old tires.