Kyosho IFW457-814 78mm Big Shock Spring Light Blue

A pair of 78mm Big Bore shock springs, wound with 1.4mm wire over eight turns and color coded light blue.

Kyosho's numbering encodes the specification directly: eight turns of 1.4mm wire at a 78mm free length, in the MS medium short length class. The color code exists so a spring can be identified at a glance in the pit box rather than measured, and Kyosho runs a graduated ladder of colors from soft to firm across the 78mm range.

Within a fixed wire diameter and free length, adding turns lowers the spring rate. At eight turns this sits in the middle of the 78mm range, softer than the 8.5 turn orange and firmer than the 7.5 turn gray.

Spring rate is the most fundamental suspension setting available. Softer lets the chassis roll and squat more, loading the tires progressively and building mechanical grip on loose or rough ground. Firmer keeps the car flatter and more responsive on high traction surfaces.

Kyosho lists these as an option part rather than a stock replacement, for the Inferno MP9 and its TKI variants, MP10, MP10e and MP777. Two are supplied.