TKR9163BW – Hinge Pin Brace (wide pivot, -1mm, C Block, EB/NB48 2.1+) is designed and required for use with the wide pivot rear arms (TKR9184W), increasing rear support and stability on medium to high-grip tracks. The wide pivot geometry improves precision in quick direction changes and enhances throttle control, resulting in a more planted and responsive buggy.