The 2005 Chevrolet Cobalt tire size depends on trim: the Base, 2D Coupe, Automatic takes P195/60R15 87S; the Base, 2D Coupe, Standard takes P195/60R15 87S; the Base, 4D Sedan, Automatic takes P195/60R15 87S; the Base, 4D Sedan, Standard takes P195/60R15 87S; the LS, 2D Coupe, Automatic takes P195/60R15 87S; the LS, 2D Coupe, Standard takes P195/60R15 87S; the LS, 4D Sedan, Automatic takes P195/60R15 87S; the LS, 4D Sedan, Standard takes P195/60R15 87S; the LT, Automatic takes P205/55R16 89H; the LT, Standard takes P205/55R16 89H; the SS takes 215/45ZR18 89Y, per the factory service manual.
Where to Buy & Install Tires for Your 2005 Chevrolet Cobalt
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Tire Rack
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