The JR-TRX426 is an aftermarket brass counterweight intended for Traxxas TRX-4 steering knuckles, adding localised mass at the hub to change steering inertia on scale trail crawlers.
Compatibility: built for Traxxas TRX-4 scale and trail crawler platforms as an optional steering block / knuckle counterweight. Fitment normally uses existing knuckle mounting points and common TRX-4 hardware, so ordinary hobby tools are usually adequate for installation.
Tuning summary: fitting brass at the knuckle increases rotational inertia, which can slow steering return and improve low-speed stability and centering; evaluate its effect alongside suspension damping and tyre setup to reach the handling you want.
This brass counterweight is a focused tuning accessory for drivers adjusting front-end steering feel on TRX-4 models; introduce it incrementally and pair with complementary setup tweaks.