TRF421X Upper Arms Pair for TRF421 Series - Tamiya 51765  [51765]

TRF421X Front Upper Arm Details

The Tamiya 51765 TRF421X A parts are delivered as two pcs of upper suspension arms designed for 1/10 scale touring cars, making replacement or upgrades simple. These arms fit the TRF421X (item 42391) and also work with the TRF421 (item 42384), enabling spare parts use or alternative tuning setups without major alterations to mounting points.

Produced in carbon reinforced nylon, the arms are intended to offer controlled flex and consistent thermal performance, which supports stable suspension behavior on grippy surfaces and carpet tracks. The chosen material aims to combine durability with the right amount of compliance to influence traction and steering feel while minimising brittle failures.

Fitting is a direct replacement using current hinge pins and fasteners on TRF421-series chassis. During installation, confirm hinge pin alignment and full suspension travel, then recheck camber and toe. These arms are also a tuning tool to alter front-end feedback for improved handling under higher grip conditions.