HPI Bullet Gunmetal Alloy Front Knuckle Arms by JAZRIDER BUL-18000-GU  [BUL-18000-GU]

Front knuckle arms for HPI Bullet

This front knuckle arm set is an RC-scale replacement part designed for HPI Bullet models where owners want a durable alloy option. The gunmetal alloy construction provides a stiffer mounting point compared with standard plastic arms, and is intended for use on model-scale nitro trucks to maintain original geometry while improving long-term wear resistance.

Compatibility is focused on the Bullet chassis family that uses the BULLET 3.0 MT and ST layouts; verify your truck’s service manual or parts diagram to confirm the knuckle housing and ball stud spacing match before purchase. These arms are supplied as a direct-replacement style component and mount to the stock steering knuckle pivots and suspension uprights.

Installation notes: transfer existing steering links and hardware, check torque on hex screws after first runs, and confirm steering geometry and toe settings after fitting. In tuning terms, alloy knuckles change flex characteristics at the front end, which can alter steering feedback and under certain track conditions reduce unwanted deflection.