I am wanting to put these on my stock cobalt ss/sc rims what size should I get they don't offer 215/45/18's all they have that would be close is 225/45/18 thanks

 

thats what i have...they fit good

 

put some 235/40/18

 

i had 225/40 18 fit awesome lil wider

 

so why did you all decide to go with the 40? instead of 45?

 

If i remember correctly the 45 in these tires are actually taller then your regular 45 and most people take that into account and get a 40. When i put these on my RL there was a difference in diameter of the 45 series of .5" or something like that between the KDW and my Dunlaps, the KDW being the taller of the two.

 

235/40=Awesome

 

225/40 is what I had with Sportline springs, they rubbed only when making a U-Turn on my Cobalt. If you don't plan on lowering, then 225/45 would work well too. Great tires BTW!