Thought it was 31 1/2
the size is on the side of the tire
The tire size for the 2000 Pontiac Grand Prix varies slightly with the model of the vehicle. The average tire size is 225/60 R16.
1949 Pontiac Chieftain Eight Series 27 tire size is 7.1 x 15".
The standard tire size for a '66 GTO is 7.75x14.
If you have 15 inch wheels on a Sunbird GT the size is 195/65-15. If you have 14 inch wheels the size is 185/75-14. I hope that helps.
Recommended tire pressure is 32psi.
The OEM size is 7.1x15"
The tire size should be P225/60R16. To verify the tire size there is a Tire Information Label on the inside of your trunk lid.
14inch
6.70x15
It could also be a broken sway bar link. About $35 to fix and is easily completed with hand tools. Incorrect size tire/wheel, broken strut, or weak or broken spring.