Get More Flex

When it comes to front suspension on heavy-duty 4WDs like Nissan Patrols and Toyota LandCruisers, the radius arm is one of the most common setups. While this design performs well on-road, it has a major drawback off-road, limited articulation. As one wheel pushes upward and the opposite side droops, the radius arms twist the axle housing along its axis, much like a torsion bar. This results in bush binding and reduced suspension travel, restricting off-road performance.

Superior Engineering SuperFlex Arms are designed to overcome this limitation. By combining two different arm styles, SuperFlex Arms change the planes of deflection, allowing greater axle travel and reducing bush bind. The result is controlled flex, improved articulation, and better handling both on and off-road. Unlike conventional radius arms, this system maintains excellent driveability while giving your 4WD the articulation it needs for serious off-road conditions.

Another key feature of the Superior Engineering SuperFlex Radius Arm design is the way torque is transferred back into the chassis. This reduces the unwanted sway often experienced with link or pivoting radius arm setups. By altering bush type and orientation, the SuperFlex system allows controlled deformation of the bushes, improving articulation without compromising stability. The use of precision adapter plates repositions the bushes, providing a wider range of flex before binding occurs, while still maintaining positive feedback and steering ‘feel’ through the chassis.

In a traditional radius arm setup, flex places the suspension bushes under a converging load, which tears at the bonding and leads to premature bush failure. The Superior Engineering SuperFlex Arm overcomes this by mounting the bushes in a vertical plane. This orientation provides a much greater range of motion, allowing the bushes to pivot with less restriction and minimal side loading. The result is smoother articulation, reduced wear, and extended component life.

The arms themselves are manufactured with accurate caster correction built directly into the design. This alleviates unnecessary stress on the bushes, further increasing suspension longevity while also maintaining correct steering geometry. For 4WD owners, that means improved handling on-road and reliable articulation off-road, without sacrificing durability.

Another breakthrough in radius arm technology is the combination of SuperFlex Arm performance with the high-speed handling benefits of a drop-box style mounting, particularly for Nissan Patrols. This design allows the suspension to absorb bumps more effectively, keeping the wheels firmly planted on the ground without giving up the articulation that SuperFlex arms are known for. The result is greater stability at speed, improved off-road control, and a suspension system that delivers both comfort and capability.

The drop-box mounting for GU and GQ Patrols features a profile nearly 20% lower than any other system on the market. It mounts specially designed radius arms, available in standard or SuperFlex configurations, that are significantly longer than factory arms, further enhancing articulation and handling. The rear arm bushing has also been upgraded to a radial-type design, replacing the failure-prone pin-type mount and providing improved durability under heavy use.

HEADING

Superior Engineering SuperFlex Arms are designed as a complete bolt-on setup and are easily engineer-approved in most states. They maximise front suspension travel and are optimised to work with most long-travel shocks and springs. Each set comes ready to fit, with full OE-style rubber bushes pressed in, SuperFlex adapter plates, and all necessary bolts and fitting instructions.

SuperFlex Radius Arms and Hybrid Arms are Australian made from 350-grade steel, CNC-machined for precise caster location, and powder-coated for maximum durability and a high-quality finish. They are available to suit popular lift heights from standard to 6 inches and are compatible with many Nissan, Toyota, and Land Rover models.