19 x 9.5 45mm offset.
If you want something that will work, go with a set of OEM wheels or wheels you know someone has on their car that they did not have any problems with.
If you want the same all the way around I think the widest you can go safely is a 18x9.5 with a 35mm offset. I think you can get C5 wheels in that size that are deep dish. It's when you step up to even larger diameter wheels like 19" that you start running out of clearance big time.
I've got an appointment today with a body shop to see if they can figure something out for my 19's in the rear.
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The body shop has my car, and they can cut and weld in new metal to create more room in the rear wheel well. It's a bit of work, but they cut me a deal at $375. The bad news is my rear tires (confirmed at 285/30ZR19's) have rubbed enough they are damaged, and the tire shop won't warranty them as they warned me that the wheels weren't supposed to go on the car, so looks like I'll need another set.
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For example, 7, 8, and 9.5" wide wheels can all sit flush with the fender. The offsets are 13, 25, and 45, respectively. The only difference is the inbound clearance grows smaller as the wheel gets wider. Therefore, any issues between any of these would be tire height or tire shape since that changes where the edge of the tire sits in relation to the wheel.
Btw, 19x9.5 45mm front is slightly inward. You can get upto a 39mm with a 9.5" wheel.
Just make sure you run a 275/30-19 up front.






