The Serpent SER440107 Uper Arm is supplied as a replacement upper suspension arm compatible with the Mini Spyder Monster truck RTR EP (SER440001). It is described as a serviceable component to restore correct suspension geometry rather than as an aftermarket performance upgrade.
Operationally, the upper arm locates the upper hub and influences camber and roll centre behaviour within the truck's suspension geometry. When fitting a replacement, ensure alignment with the lower arm and hub carrier to preserve the designed steering and suspension kinematics.
Installation points to note: confirm the arm orientation, tighten the original mounting fasteners to the correct torque or fit, check for interference across full suspension travel, and inspect ball stud and pivot interfaces for play. The item is presented purely as an RC accessory for maintenance and tuning of the model.
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