I recently went to a tire shop to purchase a 16x8 rim for my spare tire and they told me that you need at minimum a 17. They also stated that as long as you stay with a positive mm off set rating that you can go up to a 24 inch rim. Not sure on the tire size because for me to run 33x12.50 on my 06 4x4 with a 17 inch rim I need a 3 inch leveling kit.
hope this helps