Check alignment and pressures. I've ran different front and rear on multiple cars with multiple sizes and brands and never had an issue that scared me. Now I do have toe out in front slightly and on roads that aren't flat it will move slightly even with matching continental dw's, so that's why I'd check alignments out, firestone lifetime is usually 180, I get mine done every 6 months or when I change tires so usually 4-6 times a year
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