This coil spring set is built for Kyosho Mini-Z AWD MR-03 suspension use and carries the part number MZA0345SP. It includes three wire diameters 0.3mm, 0.4mm and 0.5mm, each with a 5.2mm free length, supplied as three pairs so you can swap springs during track sessions or practice.
Use the thinner 0.3mm springs for a softer response and the 0.5mm for a firmer feel while keeping the same free length to preserve ride height. Fit the springs onto MR-03 shock assemblies carefully, check seating on the retainer and match left and right sides to avoid handling imbalance.
For tuning, change one pair at a time to isolate handling effects, try different front to rear combinations to tune understeer or oversteer, and note each setup so you can return to a baseline. These springs are intended as an accessory for model-scale suspension adjustment.
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