I have a 2010 Q5 3.2 Quattro.

I have the standard 19" wheels, and I now want to change to something bigger.
What sizes should I look for, when it comes to 20-22" rims?
The 20" S-line rims are 8.5x20 with 255/45 tyres.
What about 9x20"? Would that also be okay?
And then, what sizes would fit the Q5, of 21" and 22" rims?
Would 10x21" and 10x22" fit? If yes, what tyres?
I need an expert here :)
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