Swap in these precision-engineered aluminium rear adjustable spring dampers by GPM on your LOSI HAMMER REY U4 ROCK RACER to reduce drag in the shock assembly and better absorb compressive loads. The result is a more neutral balance during rapid direction changes and rough sections. The units retain a 1.8mm spring wire diameter and use a thickened shock shaft that increases from 3.0mm to 4.0mm for added resistance to bending.
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