Hi and thanks for using 2CarPros.
The spare tire should have the same outside diameter size as what is on the car. You should never mix sizes. You also mentioned wheel size. A larger wheel can be used as long as the tire has a lower sidewall profile which again, has the same outside diameter as the tires on the vehicle.
I hope this helps. If I misunderstood your question, please let me know.
Joe
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Monday, November 19th, 2018 AT 6:43 PM