"Strapping"tape is the best, imo.. You put it on the inside of the tire, in the middle, and it acts similar to the belts ofa "belted radial" tire.. Before putting the tape on, use some alcohol on a rag, and wipe the inside of the tire, so it'll be good and clean, and the tape will adhere better.. You can find "strapping"tape at most any hardware type store.. It's very similar to regular packing tape, but it's got filament/fiber lines that run length wise, along the spool of tape.. Good luck!