The 1990 Pontiac Firebird tire size depends on trim: the Base, 3.1 T, Automatic, 4L60/MD8 takes P215/65R15; the Base, 3.1 T, Standard takes P215/65R15; the Base, 3.1 T, Automatic, 700R4/MD8 takes P215/65R15; the Base, 5.0 E, Standard takes P215/65R15; the Formula, 5.0 E, Automatic, 4L60/MD8 takes P245/50ZR16; the Base, 5.0 E, Automatic, 4L60/MD8 takes P215/65R15; the Base, 5.0 E, Automatic, 700R4/MD8 takes P215/65R15; the Formula, 5.0 E, Automatic, 700R4/MD8 takes P245/50ZR16; the Formula, 5.0 E, Standard takes P245/50ZR16; the Formula, 5.0 F, Automatic, 4L60/MD8 takes P245/50ZR16; the Formula, 5.0 F, Automatic, 700R4/MD8 takes P245/50ZR16; the Formula, 5.0 F, Standard takes P245/50ZR16; the Formula, 5.7 8, 4L60/MD8 takes P245/50ZR16; the Formula, 5.7 8, 700R4/MD8 takes P245/50ZR16; the Trans Am GTA, 5.0 F, Automatic, 4L60/MD8 takes P245/50ZR16; the Trans Am GTA, 5.0 F, Automatic, 700R4/MD8 takes P245/50ZR16; the Trans Am GTA, 5.0 F, Standard takes P245/50ZR16; the Trans Am GTA, 5.7 8, 700R4/MD8 takes P245/50ZR16; the Trans Am GTA, 5.7 8, 4L60/MD8 takes P245/50ZR16; the Trans Am, 5.0 F, Automatic, 4L60/MD8 takes P215/65R15; the Trans Am, 5.0 F, Automatic, 700R4/MD8 takes P215/65R15; the Trans Am, 5.0 F, Standard takes P215/65R15; the Trans Am, 5.7 8, 4L60/MD8 takes P215/65R15; the Trans Am, 5.7 8, 700R4/MD8 takes P215/65R15, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
Base, 3.1 T, Automatic, 4L60/MD8: P215/65R15
Base, 3.1 T, Standard: P215/65R15
Base, 3.1 T, Automatic, 700R4/MD8: P215/65R15
Base, 5.0 E, Standard: P215/65R15
Formula, 5.0 E, Automatic, 4L60/MD8: P245/50ZR16
Base, 5.0 E, Automatic, 4L60/MD8: P215/65R15
Base, 5.0 E, Automatic, 700R4/MD8: P215/65R15
Formula, 5.0 E, Automatic, 700R4/MD8: P245/50ZR16
Formula, 5.0 E, Standard: P245/50ZR16
Formula, 5.0 F, Automatic, 4L60/MD8: P245/50ZR16
Formula, 5.0 F, Automatic, 700R4/MD8: P245/50ZR16
Formula, 5.0 F, Standard: P245/50ZR16
Formula, 5.7 8, 4L60/MD8: P245/50ZR16
Formula, 5.7 8, 700R4/MD8: P245/50ZR16
Trans Am GTA, 5.0 F, Automatic, 4L60/MD8: P245/50ZR16
Trans Am GTA, 5.0 F, Automatic, 700R4/MD8: P245/50ZR16
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