This wheel hex adapter is produced for use with TRAXXAS TRX-4 HD hubs and carries the part number JR-TRX417-5MM. It is a solid brass 12mm hex insert, 5mm thick, intended to interface cleanly with TRX-4 HD wheel hex hubs and scale crawler rims.
Fitting is simple: the adapter positions over the 12mm wheel hex hub and secures the wheel in the correct axial position. As a replacement or spare it offers a metal contact surface that improves long-term wear resistance compared with some plastic hex inserts.
From a durability perspective the brass material gives a robust joint at the wheel mounting area and the 5mm dimension is useful when small offset adjustments are needed during setup. This is an aftermarket accessory compatible with TRX-4 HD assemblies.
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