I have 265/35ZR18 on 8.5" rims on the front with goldline lowering springs for about 2 yrs with NO problems. (they don't stick out, they absolutely don't rub and as long as I have had them it hasn't snowed)

 

If it does, we got bigger problems than tires...

 

Thanks for the feed back I got them installed today Wow drives like a whole different car tons of grip can stomp it even in wet with stg1 much more chush and quiet the little more width fills out the wheel and they clear the spring seat by 1/8" checked the speedo against the gps its good at 40 really happy with them think they work every bit as good as the t1r's I have on my bmw at about 800.00 less still wondering why chevy put those michilins on this car they were bad at every catigory Discount Tire gave me money for them almost fell over anyway conti dws work very well

 

I've been running larger rear tires almost since I bought the car which is an 07LS purchased new. 215/50/17 front 235/50/17 rear. No codes. No problems.

 

Not a tire/wheel guru here. I've got an '09 2LT panel with the Chrome Tech cast alum. wheels in the Firestone 215-50-17 tires. I don't know the rim width but what is the largest tire I could put on this rim (rears only) for a wider/taller footprint . Don't want any interference issues either. Does Firestone make a wider tire. I thank all in advance for any info.