The BUL-18013-BK is a 14mm black alloy wheel hex designed as a replacement part for HPI Bullet spares. It is engineered to seat on BULLET 3.0 MT and BULLET 3.0 ST wheel hubs and provides a direct-fit solution for secure wheel mounting and routine part replacement.
When replacing worn hexes or changing wheel types during setup, remove the wheel and hub retaining hardware, slide the hex onto the hub splines until fully seated, then reinstall the wheel nut or lockring. Verify hub alignment and thread engagement during assembly to ensure safe wheel retention on runs.
These wheel hexes help maintain concentric wheel mounting and reduce slop between hub and wheel, which supports consistent handling on both track and off-road surfaces. Keep fasteners torqued to spec and inspect for wear regularly as part of standard maintenance.
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