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I just got some rims a few days ago and are Size 20x9 front and 20x10.5 rear . Want to know what is the widest tire I can run on the back without rubbing or any problems looking to lower the car aswell, if you have pics running 20" rims lowered on a c6 base please upload a pic thanks.
All depends on the offset of the rear wheels. some have 325's out back on base cars. I have 315s on my drag setup with the car on lowering bolts all the way down. That on a 11 wide 73 offset.
You'd also better be sure of the "stagger" front to rear re diameters, or you're going to have strange things happening with power reduction, active handling and stability control coming on. Do a search on what the overall diameters have to be relative to each other.