The more suspension travel and the taller the sidewall the bigger the clearance needs to be. Intended use, suspension design, and how much the tire tucks into the fender all factor in as well.
In general, my goal is 1" to the inside and 1/2" to the outside.
Your 9.5" wide wheel should measure 10.5" outside to outside. Some math tells us that you have room for about 12.5" of tire. A 305/30-20 on a 20x11 would fit comfortably in that space.
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Donny
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