I "had" a '53 Sears Allstate 811.40 with correct Allstate tires. One blew up all by itself just sitting there. I think the tube finally gave up the farm after 54 years and our low humidity. Everything around is common Cushman stuff. Anyone have a 4.00 x 8" Allstate tire that is in prety good shape? I'll pay good money for a good tire!