The GPM TXMM087/SP Progressive Spring Set is a direct upgrade for the Traxxas Mini Maxx monster truck, aimed at improving ride control and tuning range. The kit contains three pairs of springs with different wire sizes: black (1.1mm), silver (1.2mm), and gold (1.3mm), letting you dial in a progressive spring rate for varied track and trail conditions. Each spring is engineered to give a nonlinear compression response that helps balance traction and stability across mixed surfaces.
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