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I know of a Japanese ND running 15x8 ET28 with no issues, but not sure about the trim/brake setup. I also know that ND Brembos & rotors do clear 15x8 ET28 RPF1s with a 3mm spacer on an NB.
I'm planning on running every 15" tire over 9" wide in the Hoosier catalog.
NASCAR 10" bias should be fun.
FA 12" should be the limit for SCCA GT2
NASA DOT 10" section rule for E0