Tamiya 51765 TRF421X A Parts upper suspension arms (x2)  [51765]

TRF421X Upper Arms

The Tamiya 51765 TRF421X A parts are a pair of upper suspension arms for 1/10 scale touring car use, supplied as two pcs for straightforward replacement or upgrade. They fit the TRF421X (item 42391) and are also compatible with the standard TRF421 (item 42384), allowing spares or alternative tuning options without major changes to mounting hardware.

Manufactured in carbon reinforced nylon, these arms are designed to retain controlled flex and thermal stability, which helps maintain predictable suspension behavior on high-grip surfaces and carpet layouts. The material choice balances toughness with enough compliance to influence traction and steering response without adding brittle failure risk.

Installation is a direct swap on compatible TRF421-series chassis, using existing hinge pins and fasteners. When fitting, verify hinge pin alignment and suspension travel, and check for correct camber and toe settings after replacement. As a tuning option, these arms can be used to slightly alter front-end feedback and help fine-tune handling for higher-grip conditions.