This 12mm alloy hex adapter is an aftermarket part for HPI Bullet Fluorescent MT and ST vehicles, supplied as a set of four. It converts the wheel mounting interface where a 12mm diameter and 9mm thickness hex seat is specified.
To install, remove the stock wheel hex or hub, fit the alloy adapter onto the wheel or axle hex, and re-use the existing hardware to secure the assembly. Always use the correct hex tool and verify the adapter is seated correctly during a dry fit.
When tuning, the adapter allows adjustments to wheel interface geometry without replacing axle or gearbox components, useful for fine-tuning track width and alignment provided the dimensions match. Check for interference with brakes, suspension arms and body mounts before running.
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