Will sidewall affects performance?

[Zandcwhite]

Exactly, 17" wheels 35" tires, close to double.
That's why I'm thinking of going with 20" wheels on tons with 42's. I'll see what Fusion or DSTRAC recommends.

I personally wouldn't go to 20's due to the up charge for tires in that size and in my opinion there's not much to be gained. On the street you might see ever so slightly better handling, but we are talking about a jeep on tons and 42's so handling won't be great either way. In my opinion for an off road vehicle the more sidewall the better. I ran 42" Iroks on my old Waggoner...on 16.5" rims.

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[Mac-n-cheesy]

These are the exact ones but in black that I'm planning on getting https://www.procompusa.com/product-...-with-5-on-5-bolt-pattern-polished-1069-6873/