This BM-S12100 unit is a rear shock spring intended for RC-scale damping systems used with B‑MAX series rear shocks. It is presented as a direct replacement spring option where the chassis list below is referenced, and its role is to influence compression and rebound characteristics when fitted to compatible rear shock assemblies.
Installation follows standard RC damper practice: remove the shock cap and spring retainer, swap the spring onto the shock shaft and reseat the retainer before reassembling the cap. When tuning, change spring rate or preload in small increments and test on the track to observe handling changes rather than relying on numerical values alone.
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