The XRAY 308264 Progressive 4S Spring Set is built to refine handling by giving a changing spring rate through compression. These 20mm springs are made for SLP shocks and help keep traction and speed stable when navigating bends.
The springs start with a softer effective rate similar to a C2.5 for improved turn entry, then increase toward a C2.8 feel as the chassis loads, giving steadier mid-corner support without abrupt breakaway.
Each pair is measured and matched by hand to ensure consistent lengths and damping response. That selection process gives drivers a predictable baseline for further tuning.
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