XRAY 303181-M X4 Medium Carbon-Fiber Fusion Rear Left Lower Arm  [XR-303181-M]

Carbon-Fiber Fusion Rear Lower Arm for XRAY X4 - Medium Left

The XRAY 303181-M CFF Carbon-Fiber Fusion rear lower arm combines a carbon fiber plate and a composite shell to produce a single, tuned suspension arm for asphalt competition. The fusion method yields a controlled mix of stiffness and flex that helps maintain traction and predictable handling through corner exits.

Suspension engineering details

XRAY's CFF arms are engineered to blend the high stiffness of graphite with the compliance of composite material. The medium compound gives a useful level of flex without sacrificing durability, keeping the arm lightweight while resisting wear from repeated track loads.

Asphalt-focused handling benefits

This medium version is tuned for asphalt surfaces and is softer than the hard option, which can translate to better mechanical grip and a more forgiving setup at higher track temperatures. The construction helps the car track more smoothly over small surface imperfections.

Fitment and installation notes

Made for the left rear position on XRAY X4 models, this arm installs with stock mounting points and hardware, offering a direct replacement that preserves chassis geometry and setup options.