Stan's has been slow to release a carbon rim and jump on the bandwagon with all of the other companies offering carbon. I would venture to guess the company hasn't felt pressure to do so because its aluminum rims are selling so well. This has put them in a unique situation to take time developing the ZTR Valor carbon rim that utilizes the NoTube's Bead Socket Technology that has set its wheels apart.
Tested: Stan's NoTubes ZTR Valor carbon wheels
Tested: Stan's NoTubes ZTR Valor carbon wheels