The Tamiya 53704 Lightweight One-way Cup Joint is a straightforward upgrade aimed at lowering rotating mass on the TRF415 chassis. The reduced mass helps deliver crisper throttle input and snappier deceleration for drivers chasing better lap-to-lap consistency.
This cup joint fits the TRF415 family as well as the TB-EVO III and TB-EVO III Surikarn Ltd models. It installs using standard assembly steps, so experienced hobbyists can swap it in without major changes to the driveline.
Hollowed sections in the cup joint reduce overall weight while retaining the part's basic function, which can improve transient response when accelerating and braking. Drivers may notice a more immediate feel from the drivetrain after installation.
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