This adapter is an RC-scale wheel hex insert created for TRAXXAS TRX-4 HD use and listed as JR-TRX417-5MM. The component is a brass 12mm hex with a 5mm face thickness designed to couple TRX-4 HD wheel hex hubs to typical scale crawler wheels.
Fitment is direct: the adapter fits over the 12mm hex on the hub and locates the wheel at the required mounting plane. It is suitable as a replacement hex insert or as a spare hop-up where a metal interface is preferred to reduce wear and give repeatable positioning.
In tuning applications this part helps with incremental offset adjustments and provides a reliable metal bearing surface where wheel rotation meets the hub. Intended only for compatible TRX-4 HD assemblies as an aftermarket upgrade.
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