All the Chevrolet Omega A sold in Brazil, used 15 inch wheels. The standard for the GL and GLS versions have 6jx15 steel wheels with 195/65 R15 tyres. The optional for both is a alloy 7jx15 with the same tires. For the CD version, they all had 7jx15 Alloys as standard and 195/65 tyres until 1994 and 205/60R15 tyres after 1995. None of them used 14 inch wheels. If you guys need more accurate information, you can contact me.
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Write about the tires you are currently driving on.