HPI Bullet Front Knuckle Arms Gunmetal Alloy Upgrade for BULLET 3.0 MT and ST - BUL-18000-GU by Jazrider  [BUL-18000-GU]

Install guidance for HPI Bullet alloy knuckles

This front knuckle arm set is an RC-scale replacement part made for HPI Bullet models where drivers want a tougher alloy option. The gunmetal alloy construction gives a firmer mounting point compared with the stock plastic arms and is intended for use on model-scale nitro trucks to retain original geometry while improving long-term wear resistance.

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

Installation notes: transfer your existing steering links and hardware, recheck hex-screw torque after the first runs, and confirm steering geometry and toe after fitting. In setup terms, alloy knuckles reduce front-end flex which can sharpen steering feedback and under some track conditions help reduce unwanted deflection.