I'm currently running the Firestone Firehawk Indy 500's (Rebranded Bridgestone RE-003) in a 255/40 and 275/35 setp. I much prefer how it feels over the old 265/35 and 285/35 setup I had before these.
And I can personally confirm S-04's do run slightly narrow. I would do the 255/275 setup on those as well.
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