FloatingOuter ring made of stainless high-performance brake steelInner ring anodisedMinimal wear on brake padsLarger diameter for added braking performanceCan only be used in conjunction with 4 piston brake caliper 5841301564404 or 6 piston brake caliper 5941301504404In combination with 4 piston brake caliper 58413015644/04 no speedometer signal will be sent