This rear shock spring is made for installation on the rear dampers of compatible Yokomo B-MAX43 series chassis. The part is identified as BM-S12110 and belongs to the SSS 12110 line; it is supplied as one replacement spring for rear shock assemblies.
Use the BM-S12110 when swapping coil inserts during damper service or when changing baseline spring rates. It meshes with the existing damper internals and changes the spring contribution inside the assembly, affecting rear support and rebound characteristics.
Fitting is a conventional rear spring exchange: remove the shock from the car, decompress the old spring from its retainer, fit the BM-S12110, then reassemble and verify ride height and damper travel. Adjust preload and damping in small steps to fine-tune handling for different surfaces.
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