This hex adapter is an RC-scale accessory designed for HPI Bullet Fluorescent MT and ST platform models. It converts or adapts the wheel hex interface using an alloy hex insert, supplied as a 4pcs set. The listed dimensions in the product name identify the intended sizing: 12mm diameter with 9mm thickness, suitable where that hex seat and thickness are required.
Installation is straightforward for hobbyists familiar with wheel and hub swaps: remove the original hex or hub, fit the alloy adapter onto the wheel or axle hex as required, and secure with the existing hardware. Use the correct hex driver and check for proper seating before running the model. The adapter’s role is primarily to match wheel hex size and to offer a solid mating surface between wheel and hub for tuning or wheel fitment changes.
In tuning and setup, this adapter can be used to alter the effective wheel interface without changing the gearbox or axle components, helping to fine-tune wheel alignment and track width when the dimensions match the model’s requirements. As with any replacement part, verify fitment on a test assembly and confirm clearance with brakes, suspension, and body mounts on the RC model.
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