either what Dave said or P195/75R14'S
205/55-16 as well
you can also look on the door jam on the driver door there is a information plate there that will tell you too
It depends on the exact model Cavalier you have, check your operators manual. Reg sedans OEM was a 14", the LS or Z24 Sports models used a OEM 205/55-16. So check your model or use your VIN and plug it into the NAPA Blue book web site, it will tell you exactly what you have.
Looking for a Used Cavalier in your area?
CarGurus has 1,386 nationwide Cavalier listings starting at $1,995.
Search Chevrolet Cavalier Questions
Chevrolet Cavalier Experts