In "Canada" 2009 Cobalt was delivered with 3 different sizes of wheels and tires as follows:
LS - 195/65R15 Mounted on seal wheels sized 15" x 6"
LT - 205/55R16 Mounted on Alloy wheels sized 16" x 6"
SS - 225/40R18 Mounted on Alloy wheels sized 18" x 7.5"
205x55R16
2.2 litre 4cyl.
From the factory there is no tweeters in the speaker system.
16x6
16"
There are many different tire manufacturers out there. For a 2007 Chevrolet Cobalt LS, you will want the size P195/60R15.
The 2009 Chevrolet Express has a V8 engine.
The 2009 Chevrolet Equinox has a V6 engine.
The 2009 Chevrolet Traverse has a V6 engine.
The 2009 Chevrolet Impala has a V6 engine.
The 2009 Chevrolet Corvette has a V8 engine.
The 2009 Chevrolet Suburban has a V8 engine.