I have checked the archives extensively and still not clear on the ideal size (if there is one) or if there are other issues that have cropped up (ie: rubbing, performance, alignment / tire wear, vibration).

It seems that aesthetics are the main factor although the forum seems divided on this issue ie: 10mm front and 12mm in rear while others like the wider 20mm.

I have checked prices as well and find H&R to be quite high. The Eibach pro-spacers seem much more reasonable and of the same material and quality. I can get (4) 10mm spacers with longer bolts shipped for $129.
As far as rubbing or tire wear - it is not clear if these are really concerns or not.

 

what is hub centric and why does the crossfire need this feature? My understanding is that hub centric spacers are vibration free at high speeds. (although from posts, this is not necessarily so) I am curious why they make spacers that are not hub-centric - how are they installed to be vibration free?

 

hub centric means...the spacer hub-bore is a direct match, size wise to your factory wheel hub.

 

i spoke with a manuf. who stated that the normal spacers if properly installed are fine. Many times the issue of vibration arises if the wheel has issues to begin with.

 

the only way i would go is...hub centric. the extra money will be worth it. trust me on this one.

 

Andrew,
I agree - although evidently many vehicles do use non-centric spacers with no ill effects. I believe an auto of this caliber requires absolute refinement. There is supposedly 1% of autos that require hub centric spacers to eliminate any possibility of vibration.