The Tamiya 9803482 Upper Arm Mount A/B is aimed at drivers who want tighter control from their TRF421. This component supports better suspension alignment so steering feel and mid-corner stability become more consistent on varied track surfaces.
Specifically produced for the TRF421 chassis, the Tamiya 9803482 installs easily and works with typical upper arm assemblies. Its sturdy build gives dependable bearing points for upper arms, contributing to predictable turn-in and cleaner exits without radical setup changes.
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