This is an RC-scale rear hard suspension arm designed for use with the optional RTC (Rear Toe Control) system on the BD8 2018 platform. The part is graphite molded and specifies an in/out suspension pin distance of 54mm with a shock pivot at 40.5mm, matching the geometry expected by the BD8 2018 rear end.
Use this arm when you need a stiffer rear link to reduce flex at the hub and keep toe settings more consistent under load. It installs in place of the standard rear arm and works with the RTC hardware to provide finer toe adjustments without altering other rear suspension geometry.
Tuning notes: a harder rear arm typically sharpens turn-in and can improve consistency on high-traction surfaces, while increasing rear snap on loose layouts; verify roll centre and shock angle after fitting and retain standard mounting hardware unless the RTC kit specifies alternatives.
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