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i've got the same size as your wheels... 295/35/18's rear, 275/35/18's f front, GY F1 D3's... i picked up the c6 z06 motorsports from bob at house of wheels.
these are 18x11 fronts and 18x12 rears. come with no tires. they have been powdercoated flack black centers and gloss black around the rims. with all brand new nuts and bolts also air stems so there like brand new rims.
will need mini tube or spacers for the rims.
backspacing- 9.3in on 12s and 8.9in on 11s
I chose the rears based on the info that the speedo reading is still close to OEM and it will not read more miles than it has. According to tire calculator im only .5mph faster than oem wheels and tires.
18x9.5 in front, 18x10.5 in back. Keep in mind that if you have 18's all around and the tire side wall is the same too then your traction control system won't work properly. It will step in on the slightest of turns and slow the car to 30-35mph before going back off again.
Not sure what everybody else does but I just disable it every time I turn on the car, along with resetting the TPMS warning because I don't have any on. It is habit now and not that big of a deal but there is the driving without traction control safety issue at play too. I did not realize this fun feature when I bought my wheels and tires but quickly became aware of it the first drive out. If I had know I would have sprung for 19's in the back. If you like the look and don't care for traction control, best of luck. Just wanted to make you aware of this before your first drive.
In order to avoid the traction control issue I went with 18's up front and 19's in the rear. You might consider this over the 18's all around.
There isn't traction control issues as long you select the right size tires. I used to have 18-19 and the Ttre selection and prices are awful. If your serious about performance stay with the 18's all the way around. If you need a little bling bling go with 18/19 mucho bling and crappy performance 19/20