I found the secret! Find a piece of plastic pipe ( 1 1/2 inch plumbing pipe works)you can ducktape to a shopvac hose, drill aproximately a 5/16 hole close to the end of the plastic pipe,, seal the end of that pipe with duck tape. Remove the valvestem core form the slick, slide the plastic pipe onto the valve stem, and suck the air out of those big fat 15x33s! Like majic, they will shrink right down.