This JR-TA201-BK set supplies black-anodized aluminum front knuckle arm uprights intended as RC-scale replacement parts for select TAMIYA touring and off-road chassis. The component is described as aluminum in the product name and serves as a direct replacement for the upright assembly used at the front steering hubs.
Purpose and tuning role: these uprights are chosen when drivers want a metal alternative to the stock plastic uprights to alter steering feel and increase repeatability during setup. As a suspension and steering component, the upright affects how ball studs and kingpins position the wheel hub, so switching to aluminum changes the mechanical interface that tuning adjustments rely on.
Installation notes: the parts are supplied as a set that mounts at the factory steering knuckle locations on the listed TAMIYA chassis. Verify screw lengths, ball stud position, and clearances on your model before fitting; some builds will require retaining the original screws, studs, or spacers from the donor car. No special tools are included with the set.
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