I have heard that 3mm spacers are required on the front of an HHR when utilizing Sky or Solstice wheels. I have also seen reports showing them used without spacers. Which is true? Considering 225/45R18 tires on an LT.

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I remember some posts that you would need spacers, a member SS fan has done this. if you can contact him.
Or use the search function, there is much about this.

 

Probably depends on which calipers and brackets you have. Tire size isn't the issue.

 

With 18's clearance won't be an issue. The only real issue with the Solstice wheels is they are for a RWD. So the offset it off for a FWD application. They fit no problem, but they will sit inside the wheel well more. Many didn't care for that look at installed spacers.

 

I'm a little late to the party, but YES....you need spacers or the rim will make contact with your strut. I tried to avoid them, but had no choice. I am running a set of
universal spacers from AutoZone.
I've been running these since around 2011 with no problems at all.
On a side note, I DID opt to replace my studs with longer ones (Dorman) so I have more threads for my lugs to grab.