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All sorts of ways to do this. I am more comfortable with a spare in my old car, not like the new cars I drive with fillers and no spare. I run front 245 45 18 and rear 285 40 18. For my spare I use the same 8 inch wheel as the front, but with a 225 40 18 to save as much room as possible, and a small bottle jack. Its 2 inches shorter than the rear, and 1.7 inches shorter than the front. It fits just fine on the front and back. I figured the size difference was not a deterrent because I am usually near the city. And I used same wheel as the front because of all the flats I have had it was always the front and if a wheel is bent it will likely be the front. Its not perfect, but keeps me happy. Of course my next flat will be a rear, the rear wheel will get destroyed, and I will be a thousand miles from the closest garage.