Just had some Pirelli P-Zero tires installed:
285/35R20 front (27.9" diameter)
295/35R20 rear (28.2" diameter)
NOTE: I'm running the OEM SS 20x9 rims on both front *and* rear of the car.
My 30,000+ mile SS needed new tires, so I have been lurking the forum and asking about tire sizes. I wanted to go wider than stock without buying a new set of wheels, so I thought I'd report my experience in case others are thinking of the same thing.
I think its a good way to get some near ZL1-sized tires on your car without springing $1000 for a new set of wheels. Would it be *better* to get the ZL1 sized wheels? Of course, but its just not in the cards for me at this time, so this is my 'compromise/low cost' setup until then.
Given all the dire interwebz warnings about exceeding the 'recommended' tire width for my 9.0" wide rims, I was a little apprehensive at first, but I think they fit great. (According to 'recommended' specs, I should have a 9.5" front wheel and a 10" rear)
The fronts fit like they should have been there from the factory. Seriously, its a perfect fit to my eye. The rears do have a small amount of bulge, but I'm old school, where tires are *supposed* to be a little wider than the wheels, so I'm liking it.
No spacers needed -- no rub anywhere, but my car is still at the factory height (not lowered), so YMMV. I was concerned about the 285's on the front, as when I test fit 275/40's, they touched the frame rail at full lock, but that was only at full droop when the car was up on the rack. I checked the 285's, and I've still got adequate clearance, including between the tire sidewall and strut.
The tires are slightly smaller diameter than the OEM 28.6", but they are close to each other front-to-rear (27.9f, 28.2r = only 0.3" diff) that I don't trigger any ABS/AH warnings.
Here's some quick pics:
An additional bonus is that these size tires will fit great if I ever get my ZL1 rims -- they'll swap right over.
Cheers,
Kent