I got some nice BBS wheels from a yard that supposedly came off of a Corvette. Two BBS RS025s and two RS026s. According to spec sheets like this one, both of those have a center bore of 70.3mm, the same as third gen Camaro's hub size (which I confirmed with my calipers to be around 70.34 on my hubs).

My calipers dont fit inside of the wheels to get a measurement, but they do not fit when I try to put them on! It is extremely close, gotta be only like .1 to .2 mm too small. I'm not quite sure why they dont fit, i cleaned the hubs and wheel bore well to make sure there is no corrosion or debris.

Does anyone have any experience with this? Or have ideas for what I should do? I could probably spend money on getting a machine shop to bore them out slightly but that may be spendy. With such little material needing to be removed, would it be too risky to try to sand the wheel bores to the right size?

Found a buddy who can machine them, will report back if it works well for future people trying the same thing.

The wheels from a sealed-bearing hub 2WD S10 require minor clearancing like that. A drill and a 3" sanding drum will do it. BRRRRR a minute, plop a rotor in. One it goes on, start the next wheel.

Took some machining and some spacers but I eventually got em on. For anyone trying this in the future reading this thread, we bored them slightly so they fit on 70.5mm hub centric spacers from Titan Wheel Accessories. 2in spacers in the front and 1.5in in the rear and it runs well.
I personally think they look nice!

and that is all that matters in the end