The JR-TA703-LB is a blue-anodized aluminum rear upright hub carrier produced for the TAMIYA TA07 chassis. It holds the wheel hub and links steering to the rear suspension; swapping plastic carriers for alloy versions reduces flex and can improve consistency in roll and cornering grip during setup work.
Fitment is standard for TA07 service: remove the rear upright assembly, swap the stock carriers with the aluminum units, and refit using the original wheel hub hardware. Ensure hinge pin alignment and check camber and toe after installation, then run conservative test laps to gauge handling changes before making further setup adjustments.
Used in tuning, the carriers provide a firmer mounting point that aids repeatability for adjustments to shock mounting positions, roll center, and camber links.