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By manufacturers, on 8.5 wide wheel minimum tire width is 225, ideal 235-245, max tire width 255. Quick googling on best tire width for wheel width should turn out several charts/tire calculators suggesting that.
As stretching tire reduces tire sidewall flex, but fitting too wide for rim adds sidewall flex (don't go overboard with either to not cause issues, keep within numbers min-ideal-max above), i'd probably keep on narrower end for more steering sharpness with 225-235.
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