The JR-TA201-BK kit contains black-coated aluminum front knuckle arm uprights intended as scale replacement parts for selected Tamiya touring and off-road chassis. The metal construction noted in the product name means the uprights substitute the stock front upright assembly that connects to the steering hubs.
Tuning impact: these uprights are selected by builders looking for a firmer mounting that tightens steering feedback and improves repeatability in setup sessions. Because uprights determine how ball studs and kingpins position the wheel hub, converting to aluminum changes the physical interface that handling adjustments depend on.
Fitting notes: supplied as a set to attach at the factory steering knuckle locations for the listed TAMIYA chassis. Always verify mounting hardware and clearance on your own vehicle before fitting; in many cases you will reuse the original screws, ball studs, and spacers from the donor car. The set does not include specialty tools.
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