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I wouldn't do it. Craziest setup I've seen is 225s on the stock 6.5" wide Vert wheels. The car was autocrossed and road raced too so it worked. 6" is pushing it.
225/55-15 (24.74").or 225/50-15 (23.85") is fine for a 6"-8" wheel, but compare them to the 205/60-15 (24.68"). You'll be hard pressed finding many choices in the 225/55-15 size though.