Not sure the reasoning behind the 19/20 wheels... Corvettes are set up for it. With 1" shorter tires in front/ sidewall is the same.
If you want big- go 345/30/19R & 295/35/19F or if you like the 20's & handling; go 325/25/20R & 265/30/20F both 26.3"diameter. Won't affect sensors & potentially handle better than vette! Just my 2cents.
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