FYI I got them OTD installed at walmart in january for $620 so there are deals to be had.

 

Sure wish MWG2 would answer my question about the diameters and if he upsized. Has ANYONE upsized? Our new $60 225/55 Blizzaks arrived yesterday and they look VERY Aggressive and should be fantastic in the snow. Sure hope they fit........

 

Tire specs at:

http://www.tirerack.com/tires/Spec.j...1=yes&place=45

 

Those specs show your diameter as 25.5" while the LS's 16"ers are 25.3" and the upsize I bought are 25.9" Therefore for the new tires I bought to fit, your size would need at least 0.2" additional radius room. Does it look like that much exists? I think the closest point for contact is the inner rear of the rear tires.

 

Not sure if this matters but my wheels are 17". I noticed that the Michelin Pilots sidewall, as compared to the OEM Tires, appears to be about an inch higher. All I know is that the tires are great. The car performs much better especially on wet pavement vs. the OEM Firestone Firehawks that came with the car.

 

Even though you have 17"ers, yours are 50 series vs. the 16's 55 series so the o.d. of the tires are similar as are the 45 series 18"ers. Those aspect ratios compare the sidewall height to the tread width of section width. Last night I poked around an HHR at work, noticing I could not get a ballpoint pen between the rear inboard corner of a rear tire and the surface behind it and then I noticed the surface flexed. That is merely a plastic fender liner that has been the source of my concerns. Hell, I think one smack with a rubber mallet would give me more than enough clearance and the worst possible fix I will need will be to attach that liner back against the metal which seems quite a ways back.