Depending on the overall size difference (tire+wheel), you could also alter shift points as well, since shift points are based on both pedal position and reported speed. Since the reported speed will be altered by the overall tire+wheel size difference, you actually alter the shift points too. Now very minor overall size differences wouldn't really be a problem, but something to keep in mind depending on how big of a difference there is in overall size.
Use the same sized tires that GM puts on the 20" Impala Rims and there will be no issue at all as the outer diameter stays the same, just a lower profile tire. The factory 20" is 245/40R20 as compared to the 245/45R19 on the 19" wheels. Overall diameter is 27.7" on both sizes.
Its same except I used plastic "HUB CENTRIC" rings and two different tire shops, three different balances and there is still a vibration. Its very subtle, it does feel like the tires needs balanced but I doubt it(BF Goodrich.)
I have aluminum ones on the way, gonna swap them out soon to see if it makes a difference.
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