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There is a lot of sketchy design in the aftermarket where solutions are not as well engineered as at the factory (not engineered at all?), and you take your chances. Two examples with the C8 IMO are exhausts (no heat shielding), and wheels. There are very few aftermarket wheels I've seen for the C8 that maintain factory offsets, and are often sold as "flush" fitment.Wheel offset I believe is regulated like bumper heights etc., however changing the wheel offset can affect wheel hub/bearing loading, and vehicle aerodynamics. In most cases for the C8 it looks to me that smaller wheel manufactures go with lower offset blanks they already have, calling them "flush" fitment as opposed to doing a proper tailored fitment for the relatively high offsets on the C8 which would be more costly. OZ, BBS and Callaway (made by OZ) are among those that seem to have done tailored solutions for the C8. Like the "flush" look on the street? OK. But know that GM engineers selected 52mm and 64mm as the factory offsets for reasons, and straying too far from that (or adding spacers) may have unintended consequences. Have a look at the offsets on the C8R - close to factory in that the wheels sit slightly inboard from the bodywork similar to the stock C8. I would tend to think GM and P&M Racing have done more than a bit of work in wind tunnels, and have studied wheel hub bearing loading with endurance/reliability a consideration.
There is a lot of sketchy design in the aftermarket where solutions are not as well engineered as at the factory (not engineered at all?), and you take your chances. Two examples with the C8 IMO are exhausts (no heat shielding), and wheels. There are very few aftermarket wheels I've seen for the C8 that maintain factory offsets, and are often sold as "flush" fitment.
Wheel offset I believe is regulated like bumper heights etc., however changing the wheel offset can affect wheel hub/bearing loading, and vehicle aerodynamics. In most cases for the C8 it looks to me that smaller wheel manufactures go with lower offset blanks they already have, calling them "flush" fitment as opposed to doing a proper tailored fitment for the relatively high offsets on the C8 which would be more costly. OZ, BBS and Callaway (made by OZ) are among those that seem to have done tailored solutions for the C8. Like the "flush" look on the street? OK. But know that GM engineers selected 52mm and 64mm as the factory offsets for reasons, and straying too far from that (or adding spacers) may have unintended consequences. Have a look at the offsets on the C8R - close to factory in that the wheels sit slightly inboard from the bodywork similar to the stock C8. I would tend to think GM and P&M Racing have done more than a bit of work in wind tunnels, and have studied wheel hub bearing loading with endurance/reliability a consideration.