[Mr2Hard2See]

It’s safe to go to 20” or 22” from the original 21” you had. I had the 21” wheel/tire setup but switched to 22”. 1 thing for sure is an 8” wheel seems quite thin. In front you could run a 9” or 9.5” and in the rear do anything from 9” to 11”. More often ppl seems to run a 9.5/10” search around the forum and you’ll see the different combos available and learn what offset folks have used without tire rubbing issues.

My top pic is 21”
2nd pic 22”
Last pic 20”