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My Space-Saver spare wheel (doughnut or mini-spare) no longer holds air so I am thinking about putting an inner tube in it.
Can I do this?
Not likely, where you going to but the valve for the inner tube? Also why would you depend your life and 3-4k pounds of metal on something that wasn't designed to do so? Go get a $5 spare from the junker if your trying to save money