Steel Wheels for MG ZR 160 - 14 or 15 inch

Hi



Im looking to fit steel wheels on a 160 for some autocross racing. I was wondering whether 14s would fit or if I would need to go for 15s? Also any idea what is the narrowest tyre width i could go for on the wheel?



I was hoping to go for 165, 65, 14, or at most 175, 65, 15



All help appreciated

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