This aluminum chamfered front upper A-arm is an optional scale accessory made for the YD-4 series of 1/10 electric RC touring cars. It replaces the factory plastic upper arm with a machined aluminum unit to improve fit at the mount and raise structural stiffness.
Supplied as left and right pieces, the arm accepts the existing YD-4 upper arm rod end and mount points. On track the upgrade reduces flex at the upper link, which tends to deliver crisper steering feedback and more consistent suspension action across repeated laps.
Fit these arms when you want a firmer front upper link and predictable mounting geometry during setup and race runs; they suit drivers focused on steering precision and consistent front suspension behavior on YD-4 cars.
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