This hard upper A-arm is an RC-scale accessory designed for Yokomo R12 and GT family cars. By using a stiffer resin than standard parts, it cuts down on unwanted play in the upper arm under lateral loads and helps keep the suspension stable during cornering. It is supplied as a tuning option to sharpen front-end feel and reduce erratic arm movement at speed.
Fitment is straightforward for those with basic A-arm servicing experience: verify mating faces are clean, confirm ball joint and hinge-pin clearances, and ensure symmetric installation on both sides. Because the component stiffens the upper link, expect a firmer front-end response while geometry remains unchanged.
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