The BM-S12100 spring is made for rear damping duties on B-MAX series rear shocks. It provides a straightforward replacement that will change compression and rebound response when installed in the correct rear shock assemblies.
Installation is standard: remove the shock cap and spring retainer, slide the spring onto the shaft, reseat the retainer and replace the cap. For tuning, adjust preload or spring choice incrementally and trial on the track to judge handling changes rather than relying only on numbers.
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