BBS RI-D 004 - 20x11 5x114.3 ET15 66CB Diamond Black Wheel PFS/Clip RequiredFORGED LINE EXCLUSIVE SERIES When the goal is ultimate performance, a forged wheel from BBS is the answer BBS has been offering forged aluminum wheels in the aftermarket since 1983. Our special multi stage Die Forging process help us create the strongest and most durable wheels possible. Starting from a billet of 6000 series or even a special 7000 series Dura aluminum, these aircraft quality alloys are forged with up to 18 million pounds of pressure.