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I think the F20 understeers with 225/245 tyres, and works better with 225/225. Going to 265 or 275 in the rear is too much, in my opinion. I also think that the stock brake rotors will work fine, changing only the brake pads for track duty.
I think the stock BMW front wheel offset will work for 235 tyres. In the rear, you will probably have to use a slightly lower offset than stock, but I am not sure how much.
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