BBS RZ-D Flow Formed Duralumin 1-Piece Wheels

BBS RZ-D - The Flow-Formed Monoblock Built From Extra-Super Duralumin

The Material That Changes the Equation

Most wheel manufacturers work with the same handful of aluminium grades. BBS RZ-D does not. Its monoblock construction begins with extra-super duralumin - an aerospace-grade alloy renowned for its strength-to-weight characteristics. The result is a wheel that weighs as little as 7.9 kg in its lightest configuration, yet carries the structural integrity that high-end platforms demand. It is not simply light. It is engineered to be light without compromise.

Where Flow-Forming Meets Aerospace Material

The RZ-D sits within the BBS Performance Line - a platform the brand has been refining since it introduced flow-forming to the aftermarket in 1996. Each wheel begins as a low-pressure casting, and the rim area is then flow-formed under high pressure at elevated temperature. This process compacts the duralumin and aligns its grain structure, increasing strength and stiffness while reducing weight. The result is a one-piece wheel that delivers a stiffness-to-weight ratio well beyond what a conventional casting can achieve. BBS develops this geometry in-house, and no replica producer has access to the tooling or the thermal treatment process.

The RZ-D Design

The RZ-D's defining feature is its ten cross spokes - slender arcs that flow from a deep, rounded centre and radiate outward toward the rim. The design is deliberately dignified rather than aggressive, which is why it has become a reference point for high-end vehicles from Lexus and Toyota Century to BMW and Mercedes-Benz. The spokes are arranged to create a sense of movement even when the wheel is stationary, and the face is visually balanced without being busy. It is a design that reads as luxurious from every angle, and correct from every distance.

For High-End Vehicles That Deserve Precision

The BBS RZ-D suits owners of Lexus LS, Toyota Century, and BMW 5 Series - vehicles where the wheel must carry presence without looking borrowed from a sports car. Every specification is validated against the platform before production begins. Reach us to begin your fitment review.