The Tamiya 54257 5mm reinforced adjusters in grey are intended to smooth movement at upper suspension arms and steering linkages, helping the listed chassis run with less internal friction. They are suitable for TRF201, TRF511, DB-01 and TRF501 layouts.
These adjusters are tailored for the models listed but can be fitted to any setup that accepts a 5mm adjuster with matching thread and length. Verify clearance around linkages before final installation.
Fitting these adjusters typically reduces binding and improves the consistency of steering inputs and suspension motion. That reliability is useful whether you are tuning for handling or everyday running.
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