Okay i've been reading lot's of thread from members asking tire size for the stock SS SC rims

Well 235/40's are the best tire size..!

from 215/45R18 to :

235/40's 0.8% too fast / 60MPH = 59.5MPH
225/45's 1.4% too slow / 60MPH = 60.8MPH
225/40's 2.1% too fast / 60MPH = 58.8MPH
215/40's 3.3% too fast / 60MPH = 58.0MPH

the best fit sized tire for the cobalt are 235/40R18... nothing else..!

I just dont want people to start buying tire that they can't drive the real speed that they are going.

Hope this can go into the Sticky..!

Also.. Want tire size..? Post here or PM me.. i will fit the best tire to fit your rims.. without messing your speedo too much

Thanks
r0k0

 

True for the SS/SC but not LS/LT's I'm not sure about the SS/NA. i'm to lazy to look up all the specks right now but LS's andLT1's come with 195/60/15 LT2's come with 205/55/16's If your 'balt came with 15's you can have it reflashed for the 16's so you can use the taller tires without throwing your speedo off.

 

www.1010tire.com

All the calcs are there, thanks for the info though

 

That's the site I use

 

not moi

but for LS / LT.. ask me.. i can spec size your tire to get a larger one.. without messing up the speedo

 

Great, but a 235 is too wide for the stock rim. Sure they will fit, but not ideal. Your gonna need a wider rim for a 235., at least an 8in.

 

huh.. stock SS SC rims are 8" wide..

they fit perfectly.. and the curb guard makes it look wider.. but it fits like a glove

 

No, our rim is 7in wide.

 

No they aren't stock SS/SC rims are 18x7 (but 235s still fit on them)