This three-spring rear tune pack is made for LOSI Promoto-MX platforms and comes as linear-rate 7075 alloy springs in three stiffness options. The set lets you change rear rates trackside without modifying shock bodies or piston configurations.
Included rates are soft, medium and firm so you can evaluate ride height and rebound differences quickly. Supplier spring geometry is listed for reference, with coil counts and internal diameter consistency to help match replacements to your existing shock shafts and spring retainers.
LOS263001
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