There are many different tire manufacturers out there. For a 2007 Chevrolet Cobalt LS, you will want the size P195/60R15.
The tire size that is required for a Chevy Cobalt can be found by going to the Fire Stone website. The website allows one to look up the tire sizes for different models of the Cobalt.
The Factory Size is 195/60/R15 or 205/55/16 (LT)
195/60r15
P195/60r15
16x6
16"
You can go uop to 2o"
15mm
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185/55 r15 82v
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p/225 60 r-16