The Factory Size is 195/60/R15 or 205/55/16 (LT)
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.
195/60r15
P195/60r15
16x6
16"
You can go uop to 2o"
15mm
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185/55 r15 82v
My 2005 Chevy Cobalt has a 13.1 gallon tank.
p/225 60 r-16