The 1991 Geo Metro tire size depends on trim: the Base, 2D Hatchback, Automatic takes P145/80R12; the Base, 2D Hatchback, Standard takes P145/80R12; the Base, 4D Hatchback, Automatic takes P145/80R12; the Base, 4D Hatchback, Standard takes P145/80R12; the LSi, 2D Convertible, Automatic takes P165/65R13; the LSi, 2D Convertible, Standard takes P165/65R13; the LSi, 2D Hatchback, Automatic takes P165/65R13; the LSi, 2D Hatchback, Standard takes P165/65R13; the LSi, 4D Hatchback, Automatic takes P165/65R13; the LSi, 4D Hatchback, Standard takes P165/65R13; the XFi takes P145/80R12, per the factory service manual.
Where to Buy & Install Tires for Your 1991 Geo Metro
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