They are back! In a move no one really saw coming, Mercedes-AMG decided to re-boot the Monoblock-style wheel on two of their new AMG cars. The GT 63 S AMG as you see above will feature them in 21″, as well as the yet-to-be-released GLS63 AMG that will size them in 23“. A 23” Monoblock! Yes, they do offer the in a polished look if matte black is your taste, but be warned, these are not cheap wheels. Not at all.