The 1991 Pontiac Grand Am tire size depends on trim: the Base, 2D Coupe, Automatic, 125C/MD9 takes P185/75R14; the Base, 2D Coupe, Automatic, 3T40/MD9 takes P185/75R14; the Base, 2D Coupe, Standard takes P185/75R14; the Base, 4D Sedan, Automatic, 125C/MD9 takes P185/75R14; the Base, 4D Sedan, Automatic, 3T40/MD9 takes P185/75R14; the Base, 4D Sedan, Standard takes P185/75R14; the LE, 2D Coupe, 2.5 U, Automatic, 125C/MD9 takes P185/75R14; the LE, 4D Sedan, 2.5 U, Automatic, 125C/MD9 takes P185/75R14; the LE, 4D Sedan, 2.3 D, 125C/MD9 takes P185/75R14; the LE, 2D Coupe, 2.3 D, 125C/MD9 takes P185/75R14; the LE, 2D Coupe, 2.5 U, Automatic, 3T40/MD9 takes P185/75R14; the LE, 2D Coupe, 2.3 A takes P185/75R14; the LE, 4D Sedan, 2.3 D, 3T40/MD9 takes P185/75R14; the LE, 2D Coupe, 2.5 U, Standard takes P185/75R14; the LE, 4D Sedan, 2.3 A takes P185/75R14; the LE, 2D Coupe, 2.3 D, 3T40/MD9 takes P185/75R14; the LE, 4D Sedan, 2.5 U, Automatic, 3T40/MD9 takes P185/75R14; the LE, 4D Sedan, 2.5 U, Standard takes P185/75R14; the SE, 2D Coupe, 2.3 A takes P205/55R16; the SE, 2D Coupe, 2.3 D, 125C/MD9 takes P205/55R16; the SE, 2D Coupe, 2.3 D, 3T40/MD9 takes P205/55R16; the SE, 4D Sedan, 2.3 D, 125C/MD9 takes P205/55R16; the SE, 4D Sedan, 2.3 D, 3T40/MD9 takes P205/55R16; the SE, 4D Sedan, 2.3 A takes P205/55R16, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
Base, 2D Coupe, Automatic, 125C/MD9: P185/75R14
Base, 2D Coupe, Automatic, 3T40/MD9: P185/75R14
Base, 2D Coupe, Standard: P185/75R14
Base, 4D Sedan, Automatic, 125C/MD9: P185/75R14
Base, 4D Sedan, Automatic, 3T40/MD9: P185/75R14
Base, 4D Sedan, Standard: P185/75R14
LE, 2D Coupe, 2.5 U, Automatic, 125C/MD9: P185/75R14
LE, 4D Sedan, 2.5 U, Automatic, 125C/MD9: P185/75R14
LE, 4D Sedan, 2.3 D, 125C/MD9: P185/75R14
LE, 2D Coupe, 2.3 D, 125C/MD9: P185/75R14
LE, 2D Coupe, 2.5 U, Automatic, 3T40/MD9: P185/75R14
LE, 2D Coupe, 2.3 A: P185/75R14
LE, 4D Sedan, 2.3 D, 3T40/MD9: P185/75R14
LE, 2D Coupe, 2.5 U, Standard: P185/75R14
LE, 4D Sedan, 2.3 A: P185/75R14
LE, 2D Coupe, 2.3 D, 3T40/MD9: P185/75R14
LE, 4D Sedan, 2.5 U, Automatic, 3T40/MD9: P185/75R14
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