My simplistic belief is their spokes have some kind of sealed, stretchable bladder inside that expands under vacuum and stays in there

I do believe they sandwich the cf between 2 milled parts of aluminum. I think that is how they get the nice finish inside and out. If you look when they remove the barrel off of the barrel form you can see what looks like the negative of the spoke. I could be wrong too

wouldn't be strong enough to hold a car if they didn't use any cores or something I think

Matthieu Libeert
Founder MAT2 Composites X Sports
website: www.mat2composites.com