245/35/19 front 275/30/19 rears on my xi.
even though xi's are awd they are still RWD biased until they feel slippage (i know this has been said earlier).
xi's still can benefit from staggered wheels but not as much as RWD does.
so just like everyone else has said: 80% aesthetics, 20% functionality.... and nothing looks better than a set of 275's pushed out to the fenders.
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