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JMB, Are those 18 X 9.5 fronts with 40mm offset, 19 X 12 rears with 59 mm offset? Also are your wheels factory or repros? If repros where did you purchase them? Thanks.
Whatever the OEM size is, yes (I borrowed these wheels for a test fitting from a C6Z owner.
Are the electronics all happy with those tire sizes?
Drove the car for about 5-8 miles without issue! The key for the BCM to stay happy is to keep the same ratio of front to rear sizing as the OEM sizes.....you can go up or down a full couple of inches as long as the F/R ratio remains very close to the OEM ratio.
I ordered C7 Z06 repros in gloss black 18 X 9.5 fronts 40mm offset and 19 X 12 rears 59mm offset from Bob at House of Wheels. Should be shipped today. Going to run Nitto Extreme 555's in the front 275-35-18 and Nitto NT05R drag radials in the rear 305/35-19.